Prime Factors Multiples Factor Trees

Use a factor tree to find the prime factorisation of 168

Find the prime factorization of 18

• 2 • 9

• 2² • 3

• 2 • 3²

• 3 • 6

Find the prime factorization of 60

• 5 • 12

• 2 • 3² • 5

• 2² • 3 • 5

• 2⁷

Find the prime factorization of 30

• 2² • 5 • 7

• 2 • 3²

• 2 • 3 • 7

• 2 • 3 • 5

Find the prime factorization of 81

• 2² • 7

• 2³ • 5 • 7

• 4³

• 3⁴

What is the missing factor?

• 1

• 2

• 5

• 8

Tags

CCSS.4.OA.C.5

What are the missing factors?

• 2 and 3

• 3 and 6

• 3 and 3

• 1 and 9

Tags

CCSS.4.OA.B.4

A prime number

• has one factor

• has more than 2 factors

• has exactly 2 factors: 1 and the number itself

Tags

CCSS.4.OA.B.4

Find the LCM (Least Common Multiple) of 18 and 24.

• 6

• 72

• 24

• 5

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