LCM for 6, 14 and 21
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What's the Least Common Multiple (LCM) of 6, 14 and 21?
Answer
LCM of 6, 14 and 21 is
42
First common multiples: 42, 84, 126, …
42 is divisible by all three: 42 ÷ 6 = 7, 42 ÷ 14 = 3, 42 ÷ 21 = 2 — and 7, 3 and 2 have no factor but 1 common to all of them, so no smaller number is. As a common denominator: multiply the top and bottom of x/6 by 7 and of y/14 by 3 and of z/21 by 2.
6 = 2 × 3
14 = 2 × 7
21 = 3 × 7
| Prime | 6 | 14 | 21 | Highest power |
|---|---|---|---|---|
| 2 | 2 | 2 | — | 2 |
| 3 | 3 | — | 3 | 3 |
| 7 | — | 7 | 7 | 7 |
— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.
LCM = 2 × 3 × 7 = 42
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See Also
- Greatest Common Factor of 3 Numbers - Find the Greatest Common Factor (GCF) of three numbers
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
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