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1. Number and place value
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United States of AmericaTennessee
Grade 4

1.12 Prime and composite numbers

Lesson
Practice
Lesson

Are you ready?

When we look at factors of numbers, we can see that some numbers only have themselves and $$1 as factors, while others have more factors. Try this problem to review finding the factors of a number.

What are all the factors of $$55? Separate the factors with commas.

Learn

What are prime and composite numbers? How can we determine if a number is prime or composite? Let's take a look and see.

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Question 1

True or False?

$$30 is a prime number.

  1. True

    A

    False

    B

Question 2

True or False?

$$63 is a composite number.

  1. True

    A

    False

    B

 

Remember!

There are some conditions to define prime and composite numbers:

  • every whole number greater than $$1 is either a prime number or a composite number
  • all even numbers greater than $$2 are composite numbers
  • to be a prime number, it can only have itself and $$1 as factors
  • $$0 and $$1 are not prime or composite numbers
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