Factoring Numbers

Which of these is a factor of 18?

• 4
• 5
• 36
• 3

Tags

CCSS.4.OA.B.4

Which is not a factor of 20?

• 4
• 2
• 5
• 40

Tags

CCSS.4.OA.B.4

What are the factors for 12?

• 1, 12

• 1, 2, 3, 4, 6, 8, 12

• 1, 2, 3, 4, 6, 12

• 2, 3, 4, 6

Tags

CCSS.4.OA.B.4

What are the factors for 25?

• 1, 2, 3, 5, 12, 25

• 1, 5, 25

• 5,25

• 1, 3, 5, 25

Tags

CCSS.4.OA.B.4

Is 23 a prime number?

• composite

• prime

Tags

CCSS.4.OA.B.4

Which number is not a multiple of 6?

• 12

• 24

• 37

• 42

Tags

CCSS.4.OA.B.4

List the first (4) multiples of 8

• 1, 2, 4, 8

• 8, 16, 24, 32

A prime number is...

• a number that has only one factor.
• a number that has at least two factors.
• a number that has more than two factors.
• a number that has only two factors.
  (1 and itself)

Tags

CCSS.4.OA.B.4

What is the greatest common factor of 20 and 16?

• 8
• 4
• 2
• 5

Which pair of numbers has a GCF of 3?

• 3 and 18
• 8 and 24
• 12 and 18
• 1 and 3