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Example: 30 and 42

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Combine the factors, eliminating duplicates.

2 x 3 x 5 x 7 = 210, the LCM

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6y ago
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9y ago

You don't need to. The least common factor of any set of positive integers is 1.

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Q: How can you use the prime factorization of two numbers to find their least common factor?
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