Prime Factorization and Greatest Common Factor

Find the GCF of each set of numbers.
28, 42, 56

• 14

• 4

• 7

• 8

What is the greatest common factor of the following numbers:

14, 42, and 49

• 3

• 7

• 2

• 84

Find the GCF of each set of numbers.
12, 30

• 4

• 2

• 5

• 6

Which pair of numbers has a GCF of 6?

• 3 and 18

• 6 and 12

• 12 and 24

• A

• B

• C

• D

greatest common factor of 24 and 48.

• 4

• 12

• 24

• 48

The table shows the number of students in the school choir. The choir teacher plans to arrange the students in equal rows. Only girls or boys will be in each row. What is the greatest number of students that could be in each row?

• 16

• 12

• 8

• 4

What is the greatest common factor of 12x + 30

• 2

• 3

• 6

• 6x

What is the greatest common factor of 6 and 21?

• 6

• 2

• 3

• 7

The choir teacher plans to arrange the students in equal rows. Only girls or boys will be in each row. What is the greatest number of students that could be in each row?

• 2

• 4

• 16

• 12