11 Famous African American Mathematicians You Should Know About

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11 Famous African American Mathematicians You Should Know About

Image: Mashup Math MJ

Last Updated: October 8th, 2024

February is Black History Month, a time to celebrate and honor the generations of African American men and women and their struggle to achieve citizenship and equal rights in American society.

Black History Month provides a special opportunity for students to explore and learn more about famous African American mathematicians and their contributions to our culture and modern institutions.

When it comes to STEM classes, one of the best ways you can celebrate Black History Month in your classroom is by sharing the contributions of famous African American Mathematicians that you and your kids may not be familiar with (but definitely should!).

Why? Because most lists of famous mathematicians in history focus heavily on men like Isaac Newton, while the stories of so many other mathematicians from various walks of life go untold.

Some ideas for celebrating these famous African American Mathematicians include focusing on a different individual each day, assigning individuals for a famous African American Mathematician research assignment, or by sharing this article on your classroom’s bulletin board.

And while you can share this list with your students and admire the accomplishments of these incredible mathematicians any time of the year, the month of February provides a focused opportunity to provide your students with deeper historical context and make connections between the past, the present, and the future.

11 Famous African American Mathematicians

Benjamin Banneker is best known for building America’s first clock.

1.) Benjamin Banneker (1731-1806)

Banneker, a mostly self-educated man in mathematics and astronomy, is best known for building America’s first clock—a wooden device that struck hourly. Using his rich understanding of trigonometry and astronomy, he accurately predicted a solar eclipse in 1789.

Banneker was also a passionate civil rights advocate. In 1791, he famously penned a letter to then secretary of state Thomas Jefferson asking for his help in improving conditions for Africans living in the United States, which highly impressed Jefferson and convinced many that blacks were intellectually equal to whites.

He died at age 74 on October 9, 1806.


Fern Hunt is best known for her work in applied mathematics in the fields of biology and genetics.

2.) Fern Hunt (1948-Present)

Fern Hunt is best known for her work in applied mathematics and mathematical biology. Throughout her great career, she has been involved with biomathematics, patterns in genetic variation, and chaos theory.

She currently works as an educator and presenter with the aim of encouraging women and minority students to pursue graduate degrees in mathematics and other STEM fields.

Hunt is a strong support of student choice, following one’s passion, and surrounding yourself with a strong support system, which are all factors that she credits to her own personal success in mathematics.

 
 

Mark Dean invented the first gigahertz computer chip.

3.) Mark Dean (1957-Present)

Dean is a famous computer scientist and engineer, credited with assisting in the development of several breakthrough computer technologies for IBM.

He invented the first gigahertz computer chip and co-invented the Industry Standard Architecture System for computing, which allows for common plug-ins such as personal printers and modems.

Dean was inducted into the National Inventor’s Hall of Fame in 1997

 
 

Elbert Frank Cox became the first black man in history to earn a Ph.D in mathematics in 1925.

4.) Elbert Frank Cox (1895-1969)

In 1925, Elbert Frank Cox was the first black man to earn a Ph.D in mathematics not only in the United States, but in the entire world.

After receiving this honor, Cox became a professor of mathematics at Howard University in Washington D.C. and eventually became chairman of the Mathematics Department in 1957. He would hold this role with great esteem until his retirement in 1965.

In 1975, the Howard University Mathematics Department established the Elbert F. Cox Scholarship Fund for undergraduate math majors to encourage young black students to pursue degrees in mathematics.

 

Image Source: Public Domain

 

Katherine Johnson was awarded the Presidential Medal of Freedom by President Barack Obama in 2015.

5.) Katherine Johnson (1918-2020)

Katherine Johnson was the main character of the critically acclaimed film Hidden Figures. Her contributions in the field of orbital mechanics, alongside fellow female African American mathematicians Dorothy Vaughan and Mary Jackson, were critical to the United States’ success in putting astronaut John Glenn into orbit in 1962.

During her 35-year career at NASA, she held a reputation for being a master of complex manual calculations and helped pioneer the use of computer programming for performing complex calculations.

She was awarded the Presidential Medal of Freedom by President Barack Obama in 2015.

Video: Katherine Johnson: The Girl Who Loved to Count by NASA

 
 

Valerie Thomas is best known for her breakthroughs in the field of 3D-imagery, paving the way for modern spatial computing.

6.) Valerie Thomas (1943-Present)

Valerie Thomas is a scientist and inventor best known for inventing the Illusion Transmitter in 1980. This technology was the first of its kind in the field of 3D-imagery and is the basis for modern 3D-televisions, video games, and movies.

From 1964 -1995, Thomas worked for NASA, developing real-time computer data systems and managing the team that developed the Landsat technology that supported the first satellite to transmit images from outer space.

Today, she continues to serve as a mentor for youth through the Science Mathematics Aerospace Research and Technology and National Technical Association.

 
 

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Lonnie Johnson holds over 120 patents and is best known for inventing the Super Soaker water gun.

7.) Lonnie Johnson (1949-Present)

Lonnie Johnson is a famous inventor, mathematician, and engineer who holds over 120 patents. He served as an engineer for the U.S. Air Force, where he worked on developing the stealth bomber, and later for NASA’s Jet Propulsion program.

He is best known for inventing the Super Soaker water gun while working at the U.S. Air Force, a product which has grossed nearly $1 Billion since 1990. He also invented a “toy projectile gun,” which eventually became the Nerf Gun.

 

Image Source: Public Domain

 

John Urschel retired from the NFL at age 26 to pursue a Ph.D. in mathematics from MIT.

8.) John Urschel (1991-Present)

John Urschel excelled in both mathematics and playing football at Penn State University and earned bachelor’s and master’s degrees in mathematics. In 2014, Urschel was drafted from Penn State into the NFL by the Baltimore Ravens, where he played his entire NFL career before retiring at age 26 to further pursue mathematics.

He is currently working towards his Ph.D. in mathematics from MIT where some of his mathematical fields of interest include graph theory, numerical linear algebra, and machine learning.

 
 

Euphemia Lofton Haynes became the first African American woman to earn a Ph.D. in mathematics in 1943.

9.) Euphemia Lofton Haynes (1890–1980)

Euphemia Lofton Haynes is famous for being the first African American woman to earn a Ph.D. in mathematics, which she achieved from the Catholic University of America in 1943.

After earning her Ph.D., she embarked on a 47-year career of advocacy for students of color, improving schools, and overcoming the harmful effects of racial segregation. During this time, she was also a math professor at the District of Columbia Teachers College, where she managed the Division of Mathematics and Business Education department.

Haynes died at the age of 89 on July 25, 1980.


Annie Easley was a leading member of the team that developed the breakthrough Centaur rocket at NASA.

10.) Annie Easley (1933-2011)

Annie Easley is famous NASA computer and rocket scientist and mathematician who contributed to several space programs, inspired others through her participation in numerous outreach programs, and broke down barriers for both women and African Americans in STEM. Most notably, she was a leading member of the team that developed the breakthrough Centaur rocket, which opened the door for the launch of many of NASA’s most important missions.

Easley was known for being a “human computer” and always fought to do her best in the face of adversity. In a 2001 interview she shared that “I just have my own attitude. I’m out here to get the job done, and I knew I had the ability to do it, and that’s where my focus was.” 

 
 

Mae Carol Jemison became the first African American woman to visit space when she went into orbit aboard NASA’s Space Shuttle Endeavour in 1992.

11.) Mae Carol Jemison (1956-Present)

Mae Carol Jemison is a mathematician, engineer, physician, and astronaut. In 1992, she became the first African American woman to visit space when she went into orbit aboard NASA’s Space Shuttle Endeavour.

Jemison also spent time as a general practice physician and in the Peace Corps before joining NASA’s astronaut program.

She continues to be involved in several initiatives and recently served on the council for an initiative called "Science Matters" which aims to encourage young children to understand and pursue careers in STEM.

 

Image: United States National Aeronautics and Space Administration (NASA) under Photo ID: S92-40463. (License)

 

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12 Days of Holiday Math Puzzles—Printable K-8 Worksheets

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12 Days of Holiday Math Puzzles—Printable K-8 Worksheets

Math teachers and parents are put to the test during the holiday season—a time when kids are anxious, easily distracted, and often struggling to stay on task.

Rather than work against your students’ anticipation and excitement, you can channel their enthusiasm for the holidays into meaningful math learning experiences by including some fun holiday-themed activities into your upcoming lesson plans.

Whether you plan on celebrating Christmas, Hanukkah, Kwanzaa, or the winter season as a whole at home or in your classroom, you can share any of our holiday-themed math puzzles with your students this holiday season.

Each puzzle challenges students to use their math skills to find the values different holiday-themed symbols and icons. The puzzles can be downloaded as printable pdf worksheets that are easy to share and are suitable for students in grades 3-8.

All of the puzzles below are samples from the holiday puzzle calendars available on the Mashup Math membership website.

Enjoy!

 
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Are your students ready for 12 days of holiday math puzzles?

 

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Download Instructions: You can download any of the challenges by right-clicking the image and saving it to your computer or by dragging-and-dropping each image to your desktop.


Day One of Twelve ☃️

▶ Math Skill: Elementary Operations

▶ Suggested Grade Levels: 3-6

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

 

Holiday Puzzle Preview


Day Two of Twelve 🦌

▶ Math Skill: Elementary Operations

▶ Suggested Grade Levels: 3-6

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Three of Twelve 🌲

▶ Math Skill: Elementary Operations

▶ Suggested Grade Levels: 3-6

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Wait! Do you want on-demand access to ALL of our holiday-themed math puzzle worksheets with complete answer keys? 🙋🏻‍♀️

Sign up for a risk-free 7-day trial of the Mashup Math membership program today and learn why more than 10,000 math teachers rely on Mashup Math resources for boosting student engagement every day!


Day Four of Twelve 🍪

▶ Math Skill: Intermediate Order of Operations

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Five of Twelve 🥞

▶ Math Skill: Intermediate Order of Operations

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

 

Holiday Puzzle Preview


Day Six of Twelve 🏂

▶ Math Skill: Intermediate Order of Operations

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Seven of Twelve ❄️

▶ Math Skill: Intermediate Order of Operations

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Wait! Do you want more holiday-themed math activities?🙋🏻‍♀️

Sign up for a risk-free 7-day trial of the Mashup Math membership program to gain on-demand access to our complete calendar of holiday-themed math puzzles with complete answer keys.


Day Eight of Twelve 🧤

▶ Math Skill: Intermediate Order of Operations

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Nine of Twelve ☕

▶ Math Skill: Multi-Step Problem Solving

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Ten of Twelve 🐧

▶ Math Skill: Multi-Step Problem Solving

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Eleven of Twelve 🦊

▶ Math Skill: Intermediate Multiplication

▶ Suggested Grade Levels: 4-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

Holiday Puzzle Preview


Day Twelve of Twelve ⛄

▶ Math Skill: Advanced Multiplication

▶ Suggested Grade Levels: 5-8

▶ PDF Worksheet: Click here to download

▶ Answer Key: Access all of our holiday-themed math puzzles and answer keys on our membership website.

 


Looking for More Holiday-Themed Math Activities?

 
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How to Divide Decimals Explained—Step-by-Step Examples and Tutorial

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How to Divide Decimals Explained—Step-by-Step Examples and Tutorial

How to Divide Decimals Explained in 3 Easy Steps

Step-by-Step Guide: How to Divide Decimals by Whole Numbers and How to Solve Decimal Divided by Decimal Problems

 

Free Step-by-Step Guide: Dividing Decimals Explained in 3 Easy Steps

 

In math, it is important to be able to work with and perform operations on decimals, which are numbers in the base-10 system that include a point that separates the whole number(s) from the attached fractional parts. For example, the number 2.5 is a decimal number that represents two and a half.

One of the more challenging operations to perform with decimals is division. However, if you know how to divide whole numbers, then you can easily learn how to divide decimals using just a few simple steps. Note that there are two different cases when it comes to dividing decimals: a decimal divided by a whole number and a decimal divided by another decimal. We will cover both cases in this guide.

Below are quick links to each section of this free Step-by-Step Guide on How to Divide Decimals:

While learning how to divide with decimals can be intimidating at first, it is a math skill that you can easily learn with practice following a simple 3-step process. This free dividing with decimals tutorial will teach you everything you need to know about how to divide with decimals, including several step-by-step practice problems for both dividing decimals by whole numbers and dividing decimals by decimals.

But, before we dive into our practice problems, let’s do a quick recap of some important vocabulary terms related to division as well as a quick review of how to perform long division. If you are already comfortable with the review information, you can use the quick links above to skip ahead to the section that best meets your needs.

 

Figure 01: How to Divide Decimals: Key Vocabulary

 

What is a dividend? What is a divisor?

In this guide on dividing decimals, we will be using the terms dividend and divisor often, so make sure that you are familiar with what they mean:

  • When dividing two numbers, the dividend is the number that is being divided.

  • When dividing two numbers, the divisor is the number of parts the dividend is being divided into.

For example, consider the division problem: 248 ÷ 8

  • 248 is the dividend because it is the number being divided

  • 8 is the divisor because 248 is being divided into 8 parts.

This example is illustrated in Figure 01 above.

Because this guide will be teaching you how to divide decimals without using a calculator, we will be using long division to solve problems. Therefore, it is important that you are familiar with the divisor/dividend notation shown in Figure 01 above, where: 248 ÷ 8 → 8 | 248

Now that you know how to identify a dividend and a divisor and the divisor/dividend notation, lets do a quick review of how to perform long division using the same example of 248 ÷ 8.

 

Figure 02: Dividing Decimals Explained: Long Division Review

 

Figure 02 above shows a step-by-step review of how to use long division to determine that 248 ÷ 8 = 31.

If you are not comfortable with performing long division, then we recommend that you pause now and do a deeper review before moving forward with this tutorial on how to divide decimals.


How to Divide Decimals by Whole Numbers

The first set of examples in this dividing decimals tutorial will focus on how to divide decimals by whole numbers and will include examples for when the dividend is the whole number and when the divisor is the whole number as well.

How to Divide Decimals by Whole Numbers

Example #1: 1.5 ÷ 2

Let’s start off with a simple example that you could probably solve without the use of long division (although we will solve it using long division anyway so that you can start to become more familiar with our 3-step process for dividing decimals).

For this example, and all of the examples that follow, you will be using the following three step method for dividing decimals:

  • Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

  • Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

  • Step Three: Use long division to solve.

We will be applying this 3-step process of all of the dividing decimals practice problems in this guide, so don’t get intimidated if you are a little confused right now. The process will make more sense and be easier to apply after we work through a few examples.

 

Figure 03: How to Divide Decimals: First, identify whether or not the divisor is a whole number.

 

Lets start with the first step:

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

In the case of 1.5 ÷ 2

  • 2 is the divisor

  • 1.5 is the dividend

As shown in Figure 03 above, it is clear that the divisor is 2, which is indeed a whole number, so, for this example, we can skip the second step and move right onto Step Three.

Also notice that in Figure 03 above, we rewrote 1.5 as 1.50 (they both mean the same thing). Adding extra zeros after the last digit of a decimal does not change the number and often helps you to perform long division, as you will see in the next step.

Step Three: Use long division to solve.

All that you have to do now is use long division to solve the problem. You can click play on the video below to see an animated step-by-step breakdown of how to perform the long division for this problem.

Based on the video and the illustrated summary shown in Figure 04 below, you can see that:

Solution: 1.50 ÷ 2 = 0.75

This solution should make sense because dividing 1.50 in half will result in 0.75. Before moving onto another similar example of a decimal divided by a whole number, we encourage you to review the above review as we will not include videos for every example.

 

Figure 04: How to Divide Decimals by Whole Numbers: Example #1 Solved

 

Dividing Decimals by Whole Numbers

Example #2: 24.36 ÷ 3

For this next example, we will be using the exact same three-step approach as Example #1.

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

For this example:

  • 3 is the divisor

  • 24.36 is the dividend

Since the divisor in this example is a whole number (3), we can skip the second step just like we did in the previous example and move onto the third and final step.

Step Three: Use long division to solve.

To solve the second example, perform long division just as you did to solve Example #1. Remember to follow your steps carefully and to line up your decimal points.

The entire process of using long division to solve 24.36 ÷ 3 is illustrated in Figure 05 below.

 

Figure 05: Dividing decimals by whole numbers explained.

 

After completing Step Three, we can conclude that:

Solution: 24.36 ÷ 3 = 8.12

Now, lets look at a few examples of a decimal divided by a whole number where the divisor is not a whole number.


How to Divide Decimals by Whole Numbers

Example #3: 92 ÷ 2.3

For this third example of dividing decimals by whole numbers, we will again be using the same three-step method as the previous two examples (as well as all on the examples that will follow this one), except that this time we will not be able to skip the second step.

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

In this case:

  • 2.3 is the divisor

  • 92 is the dividend

Since the divisor in this example is 2.3, which is not a whole number, we will have to move onto the second step (which we were able to skip in the previous two examples).

Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

When it comes to dividing decimals, we cannot have a decimal as a divisor. However, we can multiply both the divisor and the dividend by the same multiple of ten to transform the divisor into a whole number and still have a proportional relationship.

Since the final digit of 2.3 is in the tenths place value slot, we will multiply both the divisor (2.3) and the dividend (92) by 10 as shown below and in Figure 06:

  • 2.3 x 10 = 23

  • 92 x 10 = 920

*Remember that what you do to one number, you must do to the other number. If you forget to multiply both the dividend and the divisor by 10, you will get the wrong answer.

 

Figure 06: How to Divide Decimals by Whole Numbers: The divisor has to be a whole number.

 

Step Three: Use long division to solve.

After completing Step Two, all we have to do is use long division to solve 920 ÷ 23.

The step-by-step process for using long division to divide 920 by 23 is shown in Figure 07 below.

 

Figure 07: Decimal divided by a whole number

 

Finally, we can say that:

Solution: 92 ÷ 2.3 = 40

Next, lets look at one final example of how to divide decimals by whole numbers before we move onto learn all about dividing decimals by decimals.

How to Divide Decimals by Whole Numbers

Example #4: 16 ÷ 6.25

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

For the fourth example, the divisor is a decimal and the dividend is a whole number.

  • 6.25 is the divisor

  • 16 is the dividend

Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

Since the divisor is a decimal (6.25), we will have to multiply both the divisor and the dividend by the same multiple of ten.

And since, in this example, the final digit of the divisor, 6.25, is in the hundredths place value slot, we will multiply both the divisor and the dividend by 100 as shown below and in Figure 08.

  • 6.25 x 100 = 625

  • 16 x 100 = 1,600

 

Figure 08: How do you divide decimals by whole numbers?

 

After completing long division, we can conclude that:

Solution: 16 ÷ 6.25 = 2.56

Now we will move on from dividing decimals by whole numbers to learning how to divide decimals by decimals.


Dividing Decimals by Decimals

This section of our guide focused on dividing decimals by decimals. If you used the quick links at the top of the page to skip to this section, we recommend working through the examples in the dividing decimals by whole numbers section above, because it will help you to better understand how to use the following three-step method for dividing decimals by decimals:

  • Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

  • Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

  • Step Three: Use long division to solve.

Just as the previous section on dividing decimals by whole numbers, we will be following the same steps for dividing decimals by decimals.

Lets go ahead and dive into the first example.


How to Divide with Decimals

Example #1: 7.68 ÷ 0.4

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

For this first example:

  • 0.4 is the divisor

  • 7.68 is the dividend

For all of the examples in this section, we will be dividing decimals by decimals, so it will always be the case that the divisor is not a whole number. Therefore, you will always have to move onto Step Two, where you will use multiplication to transform the divisor into a whole number.

Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

Again, a decimal divided by a decimal can not be solve using long division when the divisor is not a whole number. Luckily, you can easily transform the divisor into a whole number by multiplying both the divisor and the dividend by a multiple of ten and still have a proportional relationship where you can use long division to solve the problem.

Since the final digit of 0.4 is in the tenths place value slot, you can multiply both the divisor (0.4) and the dividend (7.68) by 10 as shown below and as illustrated in Figure 09.

  • 0.4 x 10 = 4

  • 7.68 x 10 = 76.8

*Always remember that whenever you multiply the divisor by a multiple of 10, you also have to multiply the dividend by that same multiple of 10. If you forget to multiply both by the same multiple of 10, you will not be able to correctly solve the problem.

 

Figure 09: How to Divide with Decimals: Use multiples of 10 to transform the divisor into a whole number.

 

Step Three: Use long division to solve.

Now that you have transformed the divisor into a whole number, you can use long division to solve the problem. You can click play on the video below to see an animated step-by-step breakdown of how to perform the long division for this problem.

Based on the video and the illustrated summary shown in Figure 10 below, we can conclude that:

Solution: 7.68 ÷ 0.4 = 19.2

Before you continue onto the next example of how to divide decimals by decimals, we highly recommend that you review the step-by-step long division tutorial above as we will not include video tutorials for every problem.

 

Figure 10: How to divide decimals by decimals.

 

How to Divide Decimals by Decimals

Example #2: 38.4 ÷ 0.24

Just like the previous example, we will use our three step method to solve a decimal divided by a decimal problem.

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

For this first example:

  • 0.24 is the divisor

  • 38.4 is the dividend

Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

Since the divisor, 0.24, is a decimal, you will have to multiply it (and the dividend) by a power of ten to make it a whole number. Since the last digit of 0.24 is in the hundredths place value slot, we will multiply both the divisor and the dividend by 100 as shown below and in Figure 11.

  • 0.24 x 100 = 24

  • 38.4 x 100 = 3,840

 

Figure 11: Solving a decimal divided by a decimal problems.

 

Step Three: Use long division to solve.

Finally, you now have a divisor that is a whole number, so you can simply use long division to solve 3,840 ÷ 24 to find the solution to this problem, as illustrated in Figure 12 below.

 

Figure 12: How to Divide Decimals Step-by-Step

 

Solution: 38.4 ÷ 0.24 = 160

Now, lets work through one final example.


How to Divide Decimals by Decimals

Example #3: 4.76 ÷ 1.36

Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

For this first example:

  • 1.36 is the divisor

  • 4.76 is the dividend

Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

Since the divisor, 1.36, is a decimal, you will have to multiply it (and the dividend) by 100 to transform it into a whole number (we chose to multiply the dividend and the divisor by 100 because the last digit of 1.36 is in the hundredths decimal slot).

  • 1.36 x 100 = 136

  • 4.76 x 100 = 476

Step Three: Use long division to solve.

Now you can find the solution by using long division to solve 476 ÷ 136 as shown in Figure 13 below.

 

Figure 13: Dividing decimals example #3 solution.

 

Solution: 4.76 ÷ 1.36 = 3.5


Dividing Decimals Worksheet

Are you looking for some extra practice with solving problems involving dividing decimals?

You can click the link below to download your free Dividing Decimals Worksheet, which includes a complete answer key so you can check your work. Be sure to apply the three-step process shared in this guide (and also featured on the worksheet) when solving the problems.

Download Your Free Dividing Decimals Worksheet (w/ Answer Key)

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Dividing Decimals Worksheet Preview

Conclusion: How to Divide Decimals

Learning how to divide decimals by whole numbers or other decimals is an important math skill that every student will eventually have to learn how to do.

While dividing decimals can seem challenging, as long as you know how to perform long division, you can easily solve dividing decimals problems by using the following 3-step approach:

  • Step One: Identify the dividend and the divisor and determine whether or not the divisor is a whole number (if it is, move onto Step Three).

  • Step Two: If the divisor is not a whole number, multiply it by a multiple of 10 to make it a whole number (multiply tenths by 10, hundredths by 100, thousandths by 1,000, etc.). Whatever multiple of 10 that you multiplied the divisor by, you must also multiply the dividend by.

  • Step Three: Use long division to solve.

By working through the examples in this guide as well as the practice problems on the free dividing decimals worksheet, you will gain invaluable practice and experience with dividing decimals, which will make solving problems where you have to divide decimals a simple and easy task.


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21 Cute Math Pickup Lines for All Ages!

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21 Cute Math Pickup Lines for All Ages!

21 Cute Math Pickup Lines for All Ages!

Looking to break the ice and start a conversation with a math fanatic?

Sometimes the right pickup line is all that you need. When it comes to courting someone who appreciates math, using a math-themed pickup line can go a long way.

So, to help you add a few cute and effective math pickup lines to your charm portfolio, today we are sharing 21 math pickup lines for all ages that any math fan will surely love.

A pickup line is a charming, clever, and/or humorous question or remark that is used to spark a conversation with someone by grabbing their attention or interest, typically in the form of courting, flirting, or dating. Pickup lines come in a variety of forms, as some are direct and bold, while others are funny, corny, and often cringe-worthy.

The math pickup lines below range from simple and complex to irrational and unreal to funny and mildly risqué. Be sure to check them all out and see which one will be your perfect square root of one hundred! Then use them to break the ice with someone you would like to start a conversation with when the time is right.

Remember that math pickup lines should be used with the goal of breaking the ice, sparking a positive response, and starting a friendly conversation.

So, go ahead and scroll down and enjoy this list of cute and effective math pickup lines that you can use to come across as charming, witty, humorous, and mathematically savvy with that special someone you are interested in.

And, if you try some of these math pickup lines and come up empty, then pat yourself on the back and move on with your life. After all, there are plenty of points on the coordinate plane.


Math Pickup Lines

1.) Are you good at adding numbers? Try adding mine to your contacts.

2.) Are you the square root of 100? Because you’re a solid 10.

3.) If your beauty was a function, it would be exponential!


4.) Do you want to know my favorite math equation? You + Me = Us

5.) Are you a 45-degree angle? Because you’re acute-y

6.) I have memorized the first 200 digits of pi. If you gave me your phone number, I could memorize that too.


7.) If you give me your digits, I can call-cu-later!

8.) If we were a right triangle, I’d want to be adjacent to your hypotenuse.

9.) Expressing my love for you is like trying to divide by zero… It simply cannot be defined!


10.) Are you a parabola? Because you have beautiful curves.

11.) If you give me just a FRACTION of your heart, you will always be the numerator to my denominator.

12.) You must be a 90º angle. Because you are looking all-right!


13.) Are you the square root of negative one? Because you are unreal.

14.) Are we two intersecting lines? Because I feel like we’re sharing a common point.

15.) If I was a math function, then you’d be my asymptote, because I will always move towards you.


16.) Are you the center of a circle? Because my thoughts are always revolving around you.

17.) If our love was a math function, then our limit would not exist.

18.) If you’re not mean, would you let me know if I’m in your range?


19.) My feelings for you are like quadratic equations – they’re complex and they have multiple solutions.

20.) Let’s take our relationship to its limit and see if we converge.

21.) If I was a math textbook, you would be the answer key. Because you’re the solution to all of my problems.


Now that you have added a few new math pickup lines to your tool belt, you can use them to attempt to capture the interest and attention of someone who loves math. Having the right pickup line is important, but being confident in your delivery goes a long way too. Never let fear prevent you from trying to make conversation with someone, but also be willing to take no for an answer. If someone does not want to talk, then respect their decision and move on. The more that you try starting conversations, the more comfortable you will become, and using pickup lines can improve your chances, so why not give them a shot?

 

Did your math pickup line fail? Take the L and move on.

 

(Do you want more free K-8 math resources and activities in your inbox every week? Click here to sign up for our math education email newsletter)

22.) Wake up, people!

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51 Funny Teacher Memes That Will Make You Laugh Out Loud

To celebrate the art of teaching—warts and all—we are sharing some humor related to the more challenging and aggravating aspects of being a teacher by sharing some all too relatable funny teacher memes for teachers of all subjects and grade levels.

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Hard Math Problems for 6th Graders: Pumpkins and Watermelons

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Hard Math Problems for 6th Graders: Pumpkins and Watermelons

Hard Math Problems for 6th Graders

Can Your 6th Graders Solve the Pumpkins and Watermelons Problem?

Hard Math Problems for 6th Graders: The Pumpkin and Watermelon Problem

Looking for more fun math riddles and brain teasers to share with your 6th graders? If so, then you will love today’s hard math problem, which is quite the brain bender.

Here is the problem, which involves figuring out the weights of pumpkins and watermelons:

Three pumpkins and two watermelons weigh 27.5 pounds. Four pumpkins and three watermelons weigh 37.5 pounds. Each pumpkin weighs the same as the other pumpkins. Each watermelon weighs the same as the other watermelons. How much does each pumpkin weigh? How much does each watermelon weigh?

Before we dive into solving this math problem, let’s talk about why these types of multi-step problems are considered hard math problems for 6th graders in the first place.

This math problem is not the typical type of problem that a 6th grade student will encounter, as the answer cannot be found in a direct or linear way. Also, the problem requires students to work with two different variables—pumpkins and watermelons, which is a much more challenging algebraic task than they may be used to.

However, this problem is appropriately challenging for 6th graders and they have the prerequisite skills to solve this problem using a variety of possible strategies. Once your 6th graders have found the relationship and the difference between the quantities, they can choose a strategy that they are comfortable with to determine the individual weight of a pumpkin and of a watermelon.

If you want to try to solve the problem for yourself, now would be the time to pause and try and solve it on your before continuing on to the answer.

 
 

Solution: How Much Does Each Item Weigh?

While there are many ways to solve this problem, we will offer one possible solution, which utilizes tape diagrams to help students visualize a very key piece of information—that the difference between the two statements:

  • Three pumpkins and two watermelons weigh 27.5 pounds; and

  • Four pumpkins and three watermelons weigh 37.5 pounds

—is that the combination of one pumpkin and one watermelon is equal to 10 pounds.

Once students figure this out, they can use this fact to isolate P in the 27.5 lb group and determine that the weight of one pumpkin is 7.5 pounds. They can then repeat this process again using the 27.5 lb group to determine that the weight of one watermelon is 2.5 pounds, as shown in the figure below.

 

Hard Math Problems for 6th Graders

 

Final Answer…

One pumpkin weighs 7.5 pounds and one watermelon weighs 2.5 pounds.

How did you and your students do with this problem? It surely was not easy, and it required your 6th graders to make sense of a complex problem that required multiple steps and some creative problem-solving techniques to get through.

Are you looking for more fun and challenging math activities, puzzles, and brain teasers to share with your 6th grade students? Check out our free math worksheet and activity libraries.


Do YOU Want More Fun Math Riddles, Puzzles, and Brain Teasers?

Wasn’t that fun? If you want to take on more brain-bending math puzzles to sharpen your mind and improve your problem-solving skills, check out the links below:

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