LCM for 81 and 49
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What's the Least Common Multiple (LCM) of 81 and 49?
Answer
LCM of 81 and 49 is
3,969
First common multiples: 3,969; 7,938; 11,907; …
3,969 is divisible by both: 3,969 ÷ 81 = 49; 3,969 ÷ 49 = 81 — and 49 and 81 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/81 by 49 and of y/49 by 81.
81 and 49 are coprime (GCF = 1), so their LCM is simply the product: 81 × 49 = 3,969.
81 = 34
49 = 72
| Prime | 81 | 49 | Highest power |
|---|---|---|---|
| 3 | 34 | — | 34 |
| 7 | — | 72 | 72 |
— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.
LCM = 34 × 72 = 3,969
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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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LCM Table
| Number 1 | Number 2 | LCM |
|---|---|---|
| 81 | 34 | 2,754 |
| 81 | 35 | 2,835 |
| 81 | 36 | 324 |
| 81 | 37 | 2,997 |
| 81 | 38 | 3,078 |
| 81 | 39 | 1,053 |
| 81 | 40 | 3,240 |
| 81 | 41 | 3,321 |
| 81 | 42 | 1,134 |
| 81 | 43 | 3,483 |
| 81 | 44 | 3,564 |
| 81 | 45 | 405 |
| 81 | 46 | 3,726 |
| 81 | 47 | 3,807 |
| 81 | 48 | 1,296 |
| 81 | 49 | 3,969 |
| 81 | 50 | 4,050 |
| 81 | 51 | 1,377 |
| 81 | 52 | 4,212 |
| 81 | 53 | 4,293 |
| 81 | 54 | 162 |
| 81 | 55 | 4,455 |
| 81 | 56 | 4,536 |
| 81 | 57 | 1,539 |
| 81 | 58 | 4,698 |
| 81 | 59 | 4,779 |
| 81 | 60 | 1,620 |
| 81 | 61 | 4,941 |
| 81 | 62 | 5,022 |
| 81 | 63 | 567 |