Solutions by everydaycalculation.com

## What is the LCM of 21 and 1372?

The lcm of 21 and 1372 is 4116.

#### Steps to find LCM

1. Find the prime factorization of 21
21 = 3 × 7
2. Find the prime factorization of 1372
1372 = 2 × 2 × 7 × 7 × 7
3. 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 × 7 × 7
4. LCM = 4116

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