Prime Factor Trees

Use a factor tree to find prime factorization of 24.

• 2 x 3 x 2 x 3

• 2 x 3 x 2 x 2

• 6 x 2 x 2

• 2 x 3 x 4

Tags

CCSS.4.OA.B.4

Which of the following numbers is prime?

• 15

• 18

• 19

• 21

Which of the following is NOT prime?

• 11

• 13

• 19

• 21

What is the missing factor?

• 3

• 5

• 6

• 7

Tags

CCSS.4.OA.B.4

Use a factor tree to find the prime factorization of 50.

• 2 x 2 x 5 x 5

• 5 x 5 x 3 x 2

• 2 x 5 x 5

• 2 x 25

Tags

CCSS.4.OA.B.4

Use a factor tree to find the prime factorization of 54.

• 3 x 3 x 2

• 3 x 3 x 3 x 2

• 3 x 2 x 1 x 3

• 3 x 3 x 1 x 5

Use a factor tree to find the prime factorization of 60.

• 2 x 3 x 3 x 2

• 2 x 2 x 2 x 3

• 2 x 5 x 2 x 2

• 2 x 3 x 2 x 5

Tags

CCSS.4.OA.B.4

Use a factor tree to find the prime factorization of 144.

• 2 x 2 x 3 x 3 x 5

• 2 x 2 x 6 x 2

• 2 x 2 x 3 x 2 x 2 x 3

• 2 x 2 x 2 x 3 x 3

Use a factor tree to find the prime factorization of 72.

• 3 x 3 x 2 x 2 x 2

• 3 x 2 x 2 x 2

• 7 x 3 x 2 x 2

• 7 x 3 x 2

Prime numbers have:

• Exactly 2 factors
• 2 pairs of factors
• More than 2 factors
• 1 factor

Tags

CCSS.4.OA.B.4