Prime and Composite

What is the greatest common factor (GCF) of 16 and 32?

• 4

• 5

• 10

• 2

What are the first 4 multiples of 7?

• 7, 14, 22, 28

• 1, 7

• 7, 14, 21, 28

• 1, 7, 14, 21, 28

How many factors does the number 24 have?

• 6

• 8

• 2

• 24

What is the greatest common factor of the numbers 27 and 36?

• 1

• 3

• 4

• 9

12, 24, 36, 48

These numbers are all multiples of ...?

• 20

• 12

• 3

• 14

Which statement is correct?

• 37 is a multiple of 6

• 8 is a factor of 12

• 81 is a multiple of 9

• 5 only has 1 factor

What is the greatest common factor (GCF) for the numbers 30, 15, and 10?

• 1

• 5

• 3

• 2

A teacher counts her students off in groups of 4. Which choice shows the numbers she said?

• 4, 2, 1

• 1, 2, 3, 4, 5, 6, 7, 8, 9

• 4, 9, 12, 15, 21, 24, 28

• 4, 8, 12, 16, 20, 24, 28

Which list contains all prime numbers?

• 11, 13, 21, 23

• 11, 13, 16, 27

• 11, 13, 17, 19

• 11, 13, 19, 24

Which best describes the group of numbers below?

6, 9, 20, 38, 56

• They are all composite numbers.

• They are all multiples of 2.

• They are all prime numbers.

• They are all factors of 56.