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The lcm of 4 and 42 is 84.

- Find the prime factorization of 4

4 = 2 × 2 - Find the prime factorization of 42

42 = 2 × 3 × 7 - Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the lcm:

LCM = 2 × 2 × 3 × 7 - LCM =
**84**

Find least common multiple (lcm) of: 8 & 84 2 & 21 12 & 126 20 & 210 28 & 294 8 & 42 4 & 84 12 & 42 4 & 126 20 & 42 4 & 210 28 & 42 4 & 294

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