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The LCM of 42 and 28 is 84, which is the multiple of the highest power of prime factors from both numbers (22 x 3 x 7 = 2 x 2 x 3 x 7 = 84).

28 can be factored into 2, 2, and 7.

42 can be factored into 2, 3, and 7.

The most number of times two occurs in a single prime factorization is twice; three occurs once, and seven occurs once, so we do:

2 × 2 × 3 × 7 = 84.

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Q: What is the least common multiple of 28 and 42?
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