Factors and GCF

Which set of numbers shows ALL the factors of 15?

• 7, 8
• 1, 15
• 1, 3, 5, 15
• 3, 5, 15

Which set of numbers shows ALL the factors of 24?

• 2, 3, 4, 6, 8, 12, 24
• 2, 3, 4, 6, 8, 12, 24, 36
• 1, 2, 3, 4, 6, 8, 12, 24
• 1, 2, 4, 5, 7, 8, 12 ,24

Which number is a factor of 6?

• 12
• 2
• 8
• 10

Tags

CCSS.4.OA.B.4

Which number is NOT a factor of 24?

• 6
• 8
• 3
• 14

Tags

CCSS.4.OA.B.4

Which number is a factor of both 6 and 15?

• 9
• 5
• 6
• 3

Tags

CCSS.4.OA.B.4

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 exactly two factors.
  (1 and itself)

TRUE or FALSE:
The only factors of 9 are 1 and 9 making the number 9 prime.

• True
• False

Which number is prime?

• 9
• 5
• 15
• 1

Which number is NOT prime?

• 3
• 7
• 17
• 21

Is 1 a factor of 12?

• Yes
• No

Tags

CCSS.4.OA.B.4