Prime and Composite Numbers 4th Grade Math Worksheets

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PRIME number is a number which has only two factors. A COMPOSITE number has two or more factors.


PRIME numbers are numbers which only have two factors. PRIME numbers can only be divided by 1 and ITSELF.

COMPOSITE numbers are numbers which have more than two factors. COMPOSITE numbers can be divided by 1, itself, and another number.


2 is a prime number because it can only be divided by 1 and 2.
      2 ÷ 1 = 2
      2 ÷ 2 = 1

4 is a composite number because it can be divided by 1, 2, and 4.
      4 ÷ 1 = 4
      4 ÷ 2 = 2
      4 ÷ 4 = 1

Prime and Composite Numbers Worksheets

This is a fantastic bundle which includes everything you need to know about Prime and Composite Numbers across 15+ in-depth pages. These are ready-to-use Common core aligned Grade 4 Math worksheets.

Each ready to use worksheet collection includes 10 activities and an answer guide. Not teaching common core standards? Don’t worry! All our worksheets are completely editable so can be tailored for your curriculum and target audience.

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