LCM for 7, 8 and 10
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What's the Least Common Multiple (LCM) of 7, 8 and 10?
Answer
LCM of 7, 8 and 10 is
280
First common multiples: 280, 560, 840, …
280 is divisible by all three: 280 ÷ 7 = 40, 280 ÷ 8 = 35, 280 ÷ 10 = 28 — and 40, 35 and 28 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/7 by 40 and of y/8 by 35 and of z/10 by 28.
7 — prime
8 = 23
10 = 2 × 5
| Prime | 7 | 8 | 10 | Highest power |
|---|---|---|---|---|
| 2 | — | 23 | 2 | 23 |
| 5 | — | — | 5 | 5 |
| 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 = 23 × 5 × 7 = 280
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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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