This composite and prime numbers activity gets children sorting numbers into two categories and explaining why they belong there.

It is the next logical step. After our children master multiplication and division, it is time to jump into learning about prime and composite numbers. And this composite and prime numbers activity gets them recognizing these two important concepts.

## Prime Vs Composite

Before we jump into the activity it is important to understand what a prime number is and what is a composite number.

I love the definitions that Math is Fun provides for Prime and Composite Numbers.

A prime number is “A whole number greater than 1 that can **not** be made by multiplying other whole numbers.” For example, you can not multiply any whole numbers besides three and get to three. 1 x 3 = 3 and that is it!

But a composite number is “A whole number that can be made by multiplying other whole numbers.” For example, the number 4 can be made by multiplying 2 and 2.

Once those definitions are thoroughly discussed and examples are shown it is time for a little practice.

## Prep-Work

With just a little cutting this center will be ready for use.

- First, print off all pages.
- Next, cut out the number cards.
- Then pass out 10 – 20 cards per student.

Now your kiddos are ready for some sorting.

## Composite and Prime Numbers Activity

This activity is pretty self-explanatory. The children take the numbers they have been given and place them in the correct igloo.

Once they have sorted all the numbers, there is an optional record sheet you can use for a grade if needed. All they have to do, is write the prime numbers they found in one box, and the composite numbers they found in another.

At the bottom, a little writing is required. Our students are asked to explain why one number is composite and one number is prime. It is a great way to practice writing out their reasoning.

I hope your children enjoy this composite and prime numbers activity.

You’ve Got This,

Rachel

Math for Love Prime ClimbYou Can Count on Monsters: The First 100 Numbers and Their CharactersOdd and Even, Prime and Natural Numbers – Math Workbooks | Children’s Math Books