Least Common Multiples

Least Common Multiple (LCM)

by Ms. Mendez & Mrs. Rasmussen

Important Vocabulary

• Multiples- products of a number when multiplied by 1, 2, 3, 4,

• Least- smallest, lowest

• Common- the same number that appears in both numbers.

• Least common multiple (LCM)- the smallest multiple that 2 or more numbers have in common.

Steps to find the LCM

1. Make a chart for each of your given numbers.

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​2. Take each number and multiply it by 1, 2, 3, 4, & so on- taking turns between each given number.

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3. When you find a common multiple STOP!!! This will be your least common multiple (LCM).

I DO! Watch me complete the following problem.

1.) Find the LCM of 12 and 24

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Multiple Choice

What is the LCM of 2 and 14?

• 28

• 7

• 14

• 2

Multiple Choice

What is the LCM of 6 and 15?

• 15

• 30

• 3

• 10

Multiple Choice

BONUS: What is the LCM of 4,8, and 28?

• 4

• 56

• 14

• 28

Multiple Choice

Find the LCM of 8 and 20

• 8

• 4

• 40

• 160

Multiple Choice

What is the LCM of 2, 4, 6?

• 6

• 12

• 4

• 2

Multiple Choice

What is the LCM of 32 and 40?

• 180

• 160

• 140

• 200

Multiple Choice

What is the LCM of 7 and 8? 

• 7

• 8

• 42

• 56

Multiple Choice

LCM of 7 and 4

• 12

• 32

• 56

• 28

1.) Find LCM of 2 and 3

3 = 3, 6, 9, 12, 15....

2 = 2, 4, 6

LCM= 6

2.) Find the LCM of 12 and 24