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Objective

Find the least common multiple (LCM) of two or more numbers

Vocabulary

Multiple

The product of a number and any whole number

Vocabulary

Least common multiple (LCM)

The least of two or more number’s common multiples, excluding zero

Example 1 Find the LCM by Listing Multiples

Example 2 Find the LCM Using Prime Factors

Example 3 Find the LCM by Using Prime Factors

Find the LCM of 4 and 6.

Prime factor 4 and 6

Answer: LCM =12

4 62

22

3

Circle the greatest power of each number and multiply

2 2 3

12

1/3

Multiply

Identify as LCMLCM =12

Find the LCM of 8 and 12.

Answer: LCM = 24

1/3

Find the LCM of 4 and 15.

Answer: LCM = 60

Prime factor 4 and 15

4 152

2

3

5

Circle the greatest power of each number and multiply

2 2 3 560

2/3

LCM = 60

Multiply

Identify as LCM

Find the LCM of 6 and 14.

Answer: LCM = 42

2/3

Find the LCM of 18, 24, and 48.

Answer: LCM = 144

Prime factor 18, 24, and 48

18 24 482

933

2122623

224212263

Circle the greatest power of each number and multiply

2

2 2 2 2 3 3

144

3/3

Multiply Identify as LCM

Find the LCM of 12, 20, and 45.

Answer: LCM = 180

*

3/3

Assignment

Lesson 5:7 Least Common Multiple 4 - 20 All