Find LCMFind LCM

The least common multiple is the The least common multiple is the smallest of the common multiplessmallest of the common multiples

Warm-Up: CR on IntegersWarm-Up: CR on Integers

Toolbox:

Multiple: the answers to the multiplication tables for a given number

Common: #’s in both/all sets of data

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STEPS:

1. List all multiples for all given numbers

2. Circle first # that is common to both/all sets of numbers

Exit Question: 37

Find LCM and GCF of 20 and 32

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LEAST COMMON MULTIPLE NOTES (LCM

Example: Find LCM of 8 and 12

8 = 8, 16, 24, 32, 40, 48, 56

12 = 12, 24, 36, 48

24 is the LCM.

Practice on Finding LCM and Practice on Finding LCM and GCFGCF• 1. Find LCM and GCF of 20 and 301. Find LCM and GCF of 20 and 30

2020 303022 x 10 x 10 22 x 15 x 15 22 x x 5 5 x 35 5 x 3

20 = 2 x 2 x 5 20 = 2 x 2 x 5 20= 20,40,20= 20,40,6060,80,100,80,10030 = 2 x 3 x 5 30 = 2 x 3 x 5 30 = 30, 30 = 30, 6060, 90, 90

GCF = 2 x 5 = 10 GCF = 2 x 5 = 10 The LCM is 60The LCM is 60

Find LCM and GCF of…. Write Find LCM and GCF of…. Write hw on pg.36hw on pg.36

• 1. 12, 91. 12, 9

• 2. 10 and 152. 10 and 15

• 3. 3 and 63. 3 and 6

• 4. 9 and 304. 9 and 30

• 5. 18 and 305. 18 and 30

Exit Question….Exit Question….

• Find LCM and GCF of 20 and 32Find LCM and GCF of 20 and 32