LCM for 5, 10 and 20
"Least Common Multiple of 3 Numbers" Calculator
What's the Least Common Multiple (LCM) of 5, 10 and 20?
Answer
LCM of 5, 10 and 20 is
20
First common multiples: 20, 40, 60, …
20 is divisible by all three: 20 ÷ 5 = 4, 20 ÷ 10 = 2, 20 ÷ 20 = 1 — and 4, 2 and 1 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 4 and of y/10 by 2.
5 — prime
10 = 2 × 5
20 = 22 × 5
| Prime | 5 | 10 | 20 | Highest power |
|---|---|---|---|---|
| 2 | — | 2 | 22 | 22 |
| 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 × 5 = 20
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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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