LCM for 25 and 81
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What's the Least Common Multiple (LCM) of 25 and 81?
Answer
LCM of 25 and 81 is
2,025
First common multiples: 2,025; 4,050; 6,075; …
2,025 is divisible by both: 2,025 ÷ 25 = 81; 2,025 ÷ 81 = 25 — and 81 and 25 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/25 by 81 and of y/81 by 25.
25 and 81 are coprime (GCF = 1), so their LCM is simply the product: 25 × 81 = 2,025.
25 = 52
81 = 34
| Prime | 25 | 81 | Highest power |
|---|---|---|---|
| 3 | — | 34 | 34 |
| 5 | 52 | — | 52 |
— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.
LCM = 34 × 52 = 2,025
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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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