Calculate the Greatest Common Factor or GCF of 18, 57, 81 and 99
Sponsors
The instructions to find the GCF of 18, 57, 81 and 99 are the next:
1. Decompose all numbers into prime factors
| 18 | 2 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 57 | 3 |
| 19 | 19 |
| 1 |
| 81 | 3 |
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 99 | 3 |
| 33 | 3 |
| 11 | 11 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 18 | = | 2 . 32 |
| Prime factors of 57 | = | 3 . 19 |
| Prime factors of 81 | = | 34 |
| 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: