LCM for 5, 15 and 20
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What's the Least Common Multiple (LCM) of 5, 15 and 20?
Answer
LCM of 5, 15 and 20 is
60
First common multiples: 60, 120, 180, …
60 is divisible by all three: 60 ÷ 5 = 12, 60 ÷ 15 = 4, 60 ÷ 20 = 3 — and 12, 4 and 3 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/5 by 12 and of y/15 by 4 and of z/20 by 3.
5 — prime
15 = 3 × 5
20 = 22 × 5
| Prime | 5 | 15 | 20 | Highest power |
|---|---|---|---|---|
| 2 | — | — | 22 | 22 |
| 3 | — | 3 | — | 3 |
| 5 | 5 | 5 | 5 | 5 |
— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.
LCM = 22 × 3 × 5 = 60
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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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