4.OA.4

A math teacher writes a problem on the whiteboard, as shown.

Write two multiples of the number 5.

*One number needs to be composite.

*One number needs to be prime.

Which numbers could be used to answer the problem?

• 5 and 25

• 15 and 40

• The problem cannot be answered because all multiples of 5 are composite.

• The problem cannot be answered because all multiples of 5 are prime.

Which two pairs of numbers are factor pairs of the number 48?

• 2 and 28

• 3 and 16

• 4 and 8

• 6 and 8

• 7 and 7

Which set shows exactly 2 prime numbers and 2 composite numbers?

• 5, 18, 44, 87

• 7, 16, 37, 59

• 13, 27, 36, 68

• 19, 27, 59, 93

Which number is prime?

• 44

• 45

• 46

• 47

Which is a factor pair of 56?

• 1 and 55

• 5 and 6

• 6 and 50

• 7 and 8

Which pair of numbers is a factor pair of 75?

• 25 and 3

• 50 and 25

• 60 and 15

• 75 and 0