LCM for 30 and 45
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What's the Least Common Multiple (LCM) of 30 and 45?
Answer
LCM of 30 and 45 is
90
First common multiples: 90, 180, 270, …
90 is divisible by both: 90 ÷ 30 = 3, 90 ÷ 45 = 2 — and 3 and 2 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/30 by 3 and of y/45 by 2.
30 = 2 × 3 × 5
45 = 32 × 5
| Prime | 30 | 45 | Highest power |
|---|---|---|---|
| 2 | 2 | — | 2 |
| 3 | 3 | 32 | 32 |
| 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 = 2 × 32 × 5 = 90
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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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