Finding the GCF (2 Ways)

What are the strategies for finding the greatest common factor? Select all that apply.

• prime factorization

• multiply and divide

• list the factors

What are the next set of factors for 16?

• 3 x 6

• 2 x 8

• 4 x 4

4x4 equals 16. So...

• we write "4" only once.

• we write "4" twice.

What are the last 2 factors of 24?

• 4 and 5

• 4 and 6

• 4 and 7

What is the GCF of 16 and 24?

• 4

• 8

• 16

What are the last 2 factors of 15?

• 2 and 5

• 3 and 5

• 4 and 5

What are the last 2 factors of 35?

• 5 and 7

• 5 and 8

• 5 and 9

What is the GCF of 15 and 35?

• 1

• 5

• 15

• 35

Fill in the blank  2 x _ = 48

• 24

• 12

What is the GCF of 48 and 72?

• 18

• 11

• 24