Prime & Composite Practice

Front

What is a prime number?

Back

A prime number is a number that has only 2 factors: 1 and itself.

Front

What is a composite number?

Back

A composite number is a number that has more than 2 factors.

Front

Is 81 a prime number?

Back

No, 81 is a composite number because it has factors other than 1 and itself.

Front

Which of the following is a prime number: 2, 4, 6, 8?

Back

2 is a prime number.

Front

Which of the following is a composite number: 3, 5, 9, 11?

Back

9 is a composite number.

Front

True or False: All even numbers are composite.

Back

False. The number 2 is an even prime number.

Front

What are the factors of 15?

Back

The factors of 15 are 1, 3, 5, and 15.

Front

What are the factors of 29?

Back

The factors of 29 are 1 and 29 (it is a prime number).

Front

List three composite numbers.

Back

4, 6, 8 are examples of composite numbers.

Front

List three prime numbers.

Back

2, 3, 5 are examples of prime numbers.