Finding the GCF Using Factor Trees

What is the greatest common factor (GCF) of two numbers?

• The product of the two numbers

• The largest number that divides both numbers

• The smallest number that divides both numbers

• The sum of the two numbers

What are the prime factors of 6?

• 2 and 4

• 2 and 3

• 3 and 6

• 1 and 6

What is the GCF of 6 and 8?

• 4

• 3

• 2

• 1

What is the first step in finding the GCF of 16 and 24 using prime factorization?

• Subtract the numbers

• Multiply the numbers

• Create a factor tree

• Add the numbers

What is the GCF of 16 and 24?

• 6

• 8

• 2

• 4

What are the prime factors of 15?

• 3 and 5

• 2 and 7

• 3 and 7

• 2 and 5

What is the GCF of 15 and 28?

• 5

• 1

• 3

• 2

When finding the GCF of three numbers, what must be true about the prime factors?

• They must be greater than 10

• They must appear in all three numbers

• They must all be odd

• They must all be even

What is the GCF of 12, 36, and 48?

• 2

• 4

• 6

• 12

What is the GCF of 30, 12, and 8?

• 1

• 4

• 3

• 2