Number Theory (GCF/LCM/Prime-Composite/Factorization)

A ______ number has only two factors; one and itself.

• prime

• composite

Select all numbers that are prime.

• 13

• 27

• 31

• 5

• 44

A ________ number has more than two factors.

• prime

• composite

Select all numbers that are composite.

• 33

• 15

• 7

• 19

• 51

{1,2,3,4,6,8,12,24} are all ______ of 24.

• multiples

• factors

Select a factor pair for 72.

• 4 and 24

• 6 and 13

• 2 and 38

• 4 and 18

Select all of the factor pairs listed for 60.

• 2 and 30

• 4 and 15

• 5 and 14

• 7 and 8

• 5 and 12

What is the greatest common factor (GCF) of 12 and 16?

• 48

• 4

• 3

• 24

What is the greatest common factor (GCF) of 28 and 56?

• 7

• 2

• 56

• 28

8,16,24,32,40,48,... are all ______ of 8.

• multiples

• factors