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To find the least common multiple (LCM) of 21, 42, and 56, first find the prime factorization of each number.

21 = 3 x 7 42 = 2 x 3 x 7 56 = 2 x 2 x 2 x 7

Then, identify the highest power of each prime factor that appears in any of the factorizations.

LCM = 2^3 x 3 x 7 = 56 x 3 x 7 = 1176

Therefore, the least common multiple of 21, 42, and 56 is 1176.

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Wiki User

10y ago

LCM(21, 42, 56) = 168.

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Wiki User

7y ago

168

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Q: What is the least common multiple of 21 42 and 56?
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