Free Prime Number Chart

Download Your Free Prime Numbers Chart as a Printable PDF File

A prime number chart is a visual aide that highlights all of the prime numbers from 1-100.

In math, a prime number is any natural number that has only two factors: the number itself and 1. You could also classify a prime number as any positive integer that is greater than 1 that has only two factors. Some examples of prime numbers include 2, 3, 19, and 73.

Students can use a prime numbers chart to learn how to quickly identify and remember the prime numbers, and also to understand the key differences between prime numbers and composite numbers.

If you are looking for a printable prime numbers chart, this page shares two free versions of a prime number chart that are easy to download and/or print. You can click on the blue text links below to access both versions.

Prime Number Chart (Color)

Prime Number Chart (Grayscale)

**Download a variety of Prime Number Charts.**

Below you will find links to download both versions of our free Prime Numbers Chart (color version and grayscale version) as well as some information about how you can use prime number charts to help your students to learn the difference between a prime number and a composite number.

What is a Prime Number Chart?

A prime number chart is a simple ten-by-ten grid that displays the numbers 1-100, where all of the prime numbers (positive integers greater than 1 with exactly two factors) are highlighted in contrast to any non-prime (i.e. composite) numbers.

Note that majority of numbers from 1-100 are actually not prime, as you can see on the prime numbers chart shown in Figure 01 below.

In fact, there are only 25 prime numbers from 1-100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97

By looking at a prime number chart that uses color to contrast the prime numbers from the composite numbers, you can easily see which numbers from 1-100 are prime, how many of them there are, and how they are dispersed, which is an important element of understanding how numbers can be classified based on how many factors they have.

**Figure 01:** What does a prime number chart look like?

The image in Figure 01 above is the most simple type of prime numbers chart. On the chart, which includes the numbers 1-100, the boxes occupied by the prime numbers are shaded in the color pink, making the prime numbers stand out.

Below you will find links to download this simplified version of a prime number chart, and you can also download other versions of prime numbers charts that include key definitions related to prime numbers and composite numbers. If you are using a prime number chart as a visual aide for exploring and understanding the difference prime numbers and composite numbers, then the versions that include definitions may be better suited to the needs of your students.

There are many ways to use prime number charts to help students to learn the prime numbers and develop number sense and a deep conceptual understanding of how numbers are categorized based on how they can be factored. The prime numbers chart that is best for you and your students will depend on several factors including the grade level of your students, the topic you are teaching, and the reason why you are using a prime number chart to support your students. Either way, a prime number chart is a simple yet effective visual teaching tool that has a variety of used and can benefit students in several ways.

So, go ahead and scroll down to the next section to see all of our free versions of Prime Number charts, and click the corresponding links to download any prime number chart as a printable PDF file. Enjoy!