LCM for 15 and 45
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What's the Least Common Multiple (LCM) of 15 and 45?
Answer
LCM of 15 and 45 is
45
First common multiples: 45, 90, 135, …
As a common denominator: multiply the top and bottom of x/15 by 3.
15 divides 45 (45 ÷ 15 = 3), so the LCM is the larger number itself.
15 = 3 × 5
45 = 32 × 5
| Prime | 15 | 45 | Highest power |
|---|---|---|---|
| 3 | 3 | 32 | 32 |
| 5 | 5 | 5 | 5 |
LCM = 32 × 5 = 45
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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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