LCM for 12, 16 and 28
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What's the Least Common Multiple (LCM) of 12, 16 and 28?
Answer
LCM of 12, 16 and 28 is
336
First common multiples: 336; 672; 1,008; …
336 is divisible by all three: 336 ÷ 12 = 28, 336 ÷ 16 = 21, 336 ÷ 28 = 12 — and 28, 21 and 12 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/12 by 28 and of y/16 by 21 and of z/28 by 12.
12 = 22 × 3
16 = 24
28 = 22 × 7
| Prime | 12 | 16 | 28 | Highest power |
|---|---|---|---|---|
| 2 | 22 | 24 | 22 | 24 |
| 3 | 3 | — | — | 3 |
| 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 = 24 × 3 × 7 = 336
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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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