LCM for 7 and 45
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What's the Least Common Multiple (LCM) of 7 and 45?
Answer
LCM of 7 and 45 is
315
First common multiples: 315, 630, 945, …
315 is divisible by both: 315 ÷ 7 = 45, 315 ÷ 45 = 7 — and 45 and 7 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/7 by 45 and of y/45 by 7.
7 and 45 are coprime (GCF = 1), so their LCM is simply the product: 7 × 45 = 315.
7 — prime
45 = 32 × 5
| Prime | 7 | 45 | Highest power |
|---|---|---|---|
| 3 | — | 32 | 32 |
| 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 = 32 × 5 × 7 = 315
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See Also
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
- Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers
- Greatest Common Factor of 3 Numbers - Find the Greatest Common Factor (GCF) of three numbers
- Multiples of a Number - List the first 10 multiples of any number from 1 to 999
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