WEBVTT

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Here is the problem: Find the least common multiple of 15, 20.

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Find the least common multiple of the numbers.

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Prime factorization of each number.

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Use the GCF to combine 15 and 20.

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Confirm with prime factors. Take every prime that appears, each with its largest exponent.

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So the answer is 60.

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60 is the smallest positive number that every input divides exactly.

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60 divided by 15 equals 4.

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60 divided by 20 equals 3.