Factors, Multiples, Divisibility Rules

Which number is divisible by 9?

• 10,233

• 15,941

• 24,207

• 39,671

Which of the following has factors of 1, 2, 7, and 14?

• 7

• 14

• 21

• 27

What is the missing digit or digits that would make this number divisible by 5?
24,45__

• Zero

• Only 5 

• Either zero or 5

• Zero, 2, or 5

Which of the following has factors of 1, 3, 13, and 39?

• 52

• 39

• 33

• 26

Which shows the prime factorization of 30?

•  2 × 3 × 5
  

• 6 × 5
  

• 2 × 15

• 1 × 30
  

Which shows the prime factorization of 56?

•  2 × 4 × 7
  

• 2 × 7 × 3
  

•  2² × 7
  

• 2³ × 7
  

Which shows the prime factorization of 40?

• 2 × 20

• 5 × 8
  

• 2 × 2 × 2 × 5

• 2 × 10

Use prime factorization to find the greatest common factor ("GCF") of 15 and 162.

• 1

• 2

• 3

• 5

What is the greatest common factor of 36 and 60?

• 6

• 9

• 12

• 36

What are the prime factors of 33?

• 33

• 11 x 3

• 10 x 3

• 3x 3x 3x 2