LCM for 4, 18 and 24
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What's the Least Common Multiple (LCM) of 4, 18 and 24?
Answer
LCM of 4, 18 and 24 is
72
First common multiples: 72, 144, 216, …
72 is divisible by all three: 72 ÷ 4 = 18, 72 ÷ 18 = 4, 72 ÷ 24 = 3 — and 18, 4 and 3 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/4 by 18 and of y/18 by 4 and of z/24 by 3.
4 = 22
18 = 2 × 32
24 = 23 × 3
| Prime | 4 | 18 | 24 | Highest power |
|---|---|---|---|---|
| 2 | 22 | 2 | 23 | 23 |
| 3 | — | 32 | 3 | 32 |
— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.
LCM = 23 × 32 = 72
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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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