Prime Numbers and Factors

What are the factors of 20?

• 1, 2, 4, 5, 10, 20

• 1, 2, 5, 10, 20

• 1, 2, 3, 4, 10, 20

• 1, 2, 4, 5, 8, 10, 20

Tags

CCSS.4.OA.B.4

What are the factors of 16?

• 1

• 2

• 3

• 4

• 8

Tags

CCSS.4.OA.B.4

How many common factors are there in 8 and 14?

• 2

• 1

• none

• 3

• 4

What are the common factors of 12 and 18?

• 1

• 2

• 3

• 4

• 6

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)

Tags

CCSS.4.OA.B.4

Which set of numbers shows ALL the factors of 15?

• 7, 8

• 1, 15

• 1, 3, 5, 15

• 3, 5, 15

Tags

CCSS.4.OA.B.4

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

Tags

CCSS.4.OA.B.4

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