GCF & LCM

Which equation is true and uses the GCF of 12 and 30?

• 12 + 30 = 2(6 + 15)

• 12 + 30 = 3(4 + 10)

• 12 + 30 = 6(2 + 5)

• 12 + 30 = 6(2 + 7)

What is the greatest common factor of 27 and 36?

• 2

• 3

• 5

• 9

What is the greatest common factor of 11 and 14?

• 1

• 2

• 3

• 7

What is the greatest common factor of 21 and 35?

• 2

• 3

• 5

• 7

Write a number in the box to make the equation true: 45 + 30 = ___ (3 + 2)

• 15

• 10

• 12

• 20

The greatest common factor of 24 and 27 is:

• 3

• 4

• 6

• 9

Which of the following is the least common multiple of 6 and 7?

• 21

• 13

• 42

• 14

What is the least common multiple of 9 and 5?

• 14

• 45

• 18

• 36

Is the equation 42 + 33 = 3(14 + 11) written correctly as a multiple of a sum of two numbers?

• Yes

• No

• Only for some numbers

• Cannot be determined

Is the equation 12 + 9 = 3(4 + 3) written correctly as a multiple of a sum of two numbers?

• Yes

• No

• Only for some numbers

• Cannot be determined