Multiples and Factors

Which factors do 8 and 12 have in common?

• 6

• 2, 4

• 2,3,4

• 2,3,4,6,8,12

Which factors do 24 and 36 have in common?

• 2,3,4,6,18

• 2,3,4,6,8,12

• 2,3,4,6,8,9

• 2,3,4,6,12

What are all of the factors of 15?

• 1,3,5

• 1,3,5,15

• 5,10,15,30

• 15, 30, 45

Which of the following is a prime number?

• 7

• 3

• 9

• 15

Which of the following sets of numbers contains all composite numbers?

• 6, 9, 10, 11, 12

• 6, 8, 10, 12, 18

• 6, 7, 10, 12, 18

• 6, 10, 14, 23, 25

Calvin took his 24 two-color counters and put them into groups that were equal in size. Which of the following combinations is not possible?

• 6 stacks of 4

• 2 stacks of 12

• 8 stacks of 3

• 3 stacks of 6

Jeremy has 56 color tiles. When he puts them away, he puts them on a small tray in equal stacks. Which arrangement would be a possible way for Jeremy to stack his color tiles?

• 2 stacks of 27

• 3 stacks of 19

• 4 stacks of 15

• 4 stacks of 14