Relatively Prime and Gcf

The GCF of 24 and 116 is

Which two of the following are relatively prime?

Use prime factorization tree to find the GCF of 285 and 525

Use prime factorization tree to find the GCF of 63 and 189

Find the Greatest Common Factor (GCF) of 60 and 75

• 1

• 3

• 5

• 15

What is the GCF of 6 and 12?

• 2

• 3

• 4

• 6

If two numbers are relatively prime, how do you find their least common multiple?

• Divide them

• Subtract them

• Add them

• Multiply them

What is the GCF of 18 and 24? List all factors of each number to find the GCF.

• 3

• 6

• 8

• 9

Are 13 and 23 considered to be relatively prime?

Tags

CCSS.4.OA.B.4

Which pair of numbers have a GCF of 3?

• 15 and 27

• 20 and 30

• 45 and 15

• 9 and 18