Calculate the Least Common Multiple or LCM of 520 and 780
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The instructions to find the LCM of 520 and 780 are the next:
1. Decompose all numbers into prime factors
| 520 | 2 |
| 260 | 2 |
| 130 | 2 |
| 65 | 5 |
| 13 | 13 |
| 1 |
| 780 | 2 |
| 390 | 2 |
| 195 | 3 |
| 65 | 5 |
| 13 | 13 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 520 | = | 23 . 5 . 13 |
| Prime factors of 780 | = | 22 . 3 . 5 . 13 |
3. Choose the common and uncommon prime factors with the greatest exponent
Common prime factors: 2 , 5 , 13
Common prime factors with the greatest exponent: 23, 51, 131
Uncommon prime factors: 3
Uncommon prime factors with the greatest exponent: 31
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. 131. 31 = 1560
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