10/23 lesson: GCF

What is the greatest common divisor of 20 and 40?

• 10

• 20

• 40

• 5

What is the greatest common divisor of 10 and 7?

• 1

• 2

• 7

• 10

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What is the greatest common divisor of 21 and 30?

• 1

• 3

• 7

• 21

Using prime factorization, what is the greatest common divisor of 105 and 30?

• 3

• 5

• 15

• 30