Calculate the Greatest Common Factor or GCF of 25, 55, 70 and 100
Sponsors
The instructions to find the GCF of 25, 55, 70 and 100 are the next:
1. Decompose all numbers into prime factors
| 25 | 5 |
| 5 | 5 |
| 1 |
| 55 | 5 |
| 11 | 11 |
| 1 |
| 70 | 2 |
| 35 | 5 |
| 7 | 7 |
| 1 |
| 100 | 2 |
| 50 | 2 |
| 25 | 5 |
| 5 | 5 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 25 | = | 52 |
| Prime factors of 55 | = | 5 . 11 |
| Prime factors of 70 | = | 2 . 5 . 7 |
| Prime factors of 100 | = | 22 . 52 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 5
Common prime factors with the lowest exponent: 51
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 = 51 = 5
Also calculates the: