Question

There are 15 cousins playing a game. They need to divide evenly into teams. Draw a model to show one way they can split into teams. Then decide if 15 is a prime number or a composite number. Show your work. Answer 15 is a number.

Answer 1

15 is a composite number

Step-by-step explanation:

We can form 3 groups of 5 people because:

15 = 3 x 5

So, the model that shows this way to split the teams is:

If we can divide 15 into teams, we can say that 15 is a composite number.

A prime number is a number that is only divisible by 1 and by itself. Since 15 is divisible by 3 because we form 3 teams, we get that 15 is not prime, so it is composite.