LCM/GCF

Least Common Multiples and Greatest Common Factor Practice

By Bethany Blevins

We use the LCM to create common denominators. Common denominators are needed to add and subtract fractions.

Multiple Select

When do we use the LCM?

• subtracting fractions

• adding fractions

• finding a common denominator

• multiplying fractions

Multiple Choice

List the first five multiples of 7

• 7, 15, 21, 29, 35

• 7, 14, 23, 28, 35

• 7, 16, 21, 28, 35

• 7, 14, 21, 28, 35

Multiple Choice

What is the least common denominator of 6/8 and 4/12?

• 12

• 8

• 24

• 16

Open Ended

List the first seven multiples of 8

Multiple Choice

What is the greatest common factor of 4 and 8?

• 2

• 8

• 4

• 1

Multiple Choice

What is the LCM of 5 & 20?

• 100

• 80

• 20

• 5

Open Ended

List the first eight multiples of 6

Multiple Choice

What is the least common denominator of 1/9 & 2/3?

• 6

• 3

• 21

• 9

Multiple Choice

Ethan ate 4/7 of one pie and Elle ate 23/49 of a different pie. What number would you use to create a common denominator?

• 7

• 49

• 28

• 198

Open Ended

What is the LCM of 12 and 8?

Multiple Choice

What is the common denominator of 2/9 and 4/7

• 18

• 63

• 21

• 24

• 28

Open Ended

What is the LCM of 12 and 14?

Multiple Choice

Makayla and Noelle both bought a pizza on National Pizza Day. They wanted to celebrate together, Makayla cut her pizza into 16 slices. Noelle cut her pizza into 8 slices. Could they make equivalent pizza slices?

• Yes

• No

Multiple Choice

Find the correct equivalent fraction.

• 6/9

• 9/9

• 6/6

• 2/3

Multiple Choice

When a number only has 2 factors (one and itself), it is...

• hopeless

• sad

• prime

• composite

Multiple Choice

A _________ is a number that divides into another number exactly and without leaving a remainder.

• Multiple

• Product

• Divisor

• Factor

Multiple Select

Which are these are factors of 18?

• 2

• 3

• 18

• 8

• 9

Multiple Select

Select any number that is a factor of 36.

• 1

• 2

• 3

• 4

• 6