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Least Common Multiple Lesson 3-6

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Multiples A multiple is formed by multiplying a given number by the counting numbers. The counting numbers are 1, 2, 3, 4, 5, 6, etc.

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Example: List the multiples of 4: 4 x 1 = 4 4 x 2 = 8 4 x 3 = 12 4 x 4 = 16 4 x 5 = 20 4 x 6 = 24 Counting Numbers So, the multiples of 4 are 4, 8, 12, 16, 20, 24, 28, etc.

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What are the first five multiples of 13? 13 x 1 =13 13 x 2 = 26 13 x 3 = 39 13 x 4 = 52 13 x 5 = 65 13, 26, 39, 52, 65

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Find the Missing Multiples 6, 12, 18, ____, ____ ___, 6, 9, 12, ____, ____, 21 ___, 24, 36, 48, 60, ____ 2430 31518 12 72

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Least Common Multiple (LCM) The least common multiple is the smallest number that is common between two lists of multiples.

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EXAMPLE: Find the LCM of 12 and 18 The multiples of 12: 12 x 1 = 12 12 x 2 =24 12 x 3 = 36 12 x 4 = 48 12 x 5 =60 The multiples of 18: 18 x 1 = 18 18 x 2 = 36 18 x 3 = 54 18 x 4 = 72 18 x 5 = 90

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12, 24, 36, 48, 60 18, 36, 54, 72, 90 The first number you see in both lists is 36. The least common multiple of 12 and 18 is 36.

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Example 2: Find the LCM of 9 and 10 9, 18, 27, 36, 45, 54, 63, 72 10, 20, 30, 40, 50, 60, 70, 80 If you don’t see a common multiple, make each list go further. 81, 90, 99 90, 100, 110 The LCM of 9 and 10 is 90

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Example 3: Find the LCM of 4 and 12 4, 8, 12, 16 12, 24, 36 Answer: 12

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Example 5: Find the LCM of 6 and 20 6, 12, 18, 24, 30, 36 20, 40, 60, 80, 100, 120 42, 48, 54, 60 Answer: 60

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Classwork: Practice Finding the LCM and once you’ve gotten at least 20 correct, choose any of the 3 games to play: http://www.aaamath.com/g57i-lcm.html Homework Time p145, 1-51 ODD http://www.aaamath.com/g57i-lcm.html

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