Calculate the Least Common Multiple or LCM of 280, 21, 58, 7, 3 and 18
Sponsors
The instructions to find the LCM of 280, 21, 58, 7, 3 and 18 are the next:
1. Decompose all numbers into prime factors
| 280 | 2 |
| 140 | 2 |
| 70 | 2 |
| 35 | 5 |
| 7 | 7 |
| 1 |
| 21 | 3 |
| 7 | 7 |
| 1 |
| 58 | 2 |
| 29 | 29 |
| 1 |
| 7 | 7 |
| 1 |
| 3 | 3 |
| 1 |
| 18 | 2 |
| 9 | 3 |
| 3 | 3 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 280 | = | 23 . 5 . 7 |
| Prime factors of 21 | = | 3 . 7 |
| Prime factors of 58 | = | 2 . 29 |
| Prime factors of 7 | = | 7 |
| Prime factors of 3 | = | 3 |
| Prime factors of 18 | = | 2 . 32 |
3. Choose the common and uncommon prime factors with the greatest exponent
Common prime factors: None
Common prime factors with the greatest exponent: None
Uncommon prime factors: 2 , 5 , 7 , 3 , 29
Uncommon prime factors with the greatest exponent: 23, 51, 71, 32, 291
4. Calculate the Least Common Multiple or LCM
Remember, to find the LCM of several numbers you must multiply the common and uncommon prime factors with the greatest exponent of those numbers.
LCM = 23. 51. 71. 32. 291 = 73080
Also calculates the: