Calculate the Greatest Common Factor or GCF of 51, 87, 90 and 99
Sponsors
The instructions to find the GCF of 51, 87, 90 and 99 are the next:
1. Decompose all numbers into prime factors
| 51 | 3 |
| 17 | 17 |
| 1 |
| 87 | 3 |
| 29 | 29 |
| 1 |
| 90 | 2 |
| 45 | 3 |
| 15 | 3 |
| 5 | 5 |
| 1 |
| 99 | 3 |
| 33 | 3 |
| 11 | 11 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 51 | = | 3 . 17 |
| Prime factors of 87 | = | 3 . 29 |
| Prime factors of 90 | = | 2 . 32 . 5 |
| Prime factors of 99 | = | 32 . 11 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3
Common prime factors with the lowest exponent: 31
4. Calculate the Greatest Common Factor or GCF
Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.
GCF = 31 = 3
Also calculates the: