Review

Which are factors of 20?

• 2,10,5,4,1,20

• 3,5,7,9

• 40,80,100

• 15,25,35

Which is a factor pair of 24?

• 2,12

• 3,5

• 7,6

• 8,5

Which number is prime?

• 15

• 21

• 5

• 12

Which number is the only even prime number?

• 2

• 4

• 6

• 12

what are factors of 42?

• 1,42,2,21,7,6

• 2,24

• 48,2

• 3,4,7,8

Which numbers are prime?

• 3,5,7,15

• 3,5,2,1,7,13

• 2,4,6,8,10

• 3,5,7,9,11,13,15,21

List the factors of 30

• 1,30,2,15,3,10,5,6

• 2,4,6,8,10,12

• 3,10,5,7

• 8,7,5,8,6

Which number is prime?

• 13

• 8

• 21

• 35

Which are factor pairs of 45?

• 1,45,5,9

• 1,3,7,9

• 5,7,8,9

• 7,9,5,2

Which number is Composite?

• 3

• 5

• 11

• 12