Prime and Composite Numbers

Use these printable PDF worksheets to teach students to find and identify prime and composite numbers.

For worksheets on prime factorization, please jump over to our
factoring worksheets section.

Prime & Composite
This worksheet is a basic introduction to finding and identifying prime and composite numbers.
3rd through 5th Grades
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Common Core
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On this printable worksheet, your students list all of the factors of a given number. Then they tell whether the number is composite or prime.
3rd through 5th Grades
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Common Core
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Students will list factors of a number on the table. Then they will tell which numbers are prime and which are composite.
3rd through 5th Grades
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Common Core
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Help the mouse find his way to the block of cheese. To do so, students must make a path by coloring only the boxes with prime numbers.
3rd through 5th Grades
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Common Core
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This page has a set of short-answer questions about factoring, composite and prime numbers.
3rd through 5th Grades
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Common Core
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Prime Number Chart
This 120 chart highlights prime numbers in orange.
3rd through 5th Grades
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Common Core
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Use colored pencils or crayons to shade all of the prime numbers in red and the composite numbers in blue.
3rd through 5th Grades
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Common Core
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Sieve of Eratosthenes
Use the sieve of Eratosthenes is a number table that you can use to find prime numbers. Students use colored pencils to mark the multiples of 2, 3, 5, and 7. The numbers that are not marked are prime numbers.
3rd through 6th Grades
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Common Core
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See Also:
Factoring Worksheets

This page contains prime factorization trees, as well as activities that require students to list factors of a number. There are also worksheets on proper factors and perfect numbers.

Multiples

Here are some activities to help students find multiples of numbers.

Pictures of Worksheets

Prime Number Printables


Prime Number Worksheets and Activities


Prime and Composite Numbers Worksheets