Calculate the Greatest Common Factor or GCF of 12, 22 and 28
Sponsors
The instructions to find the GCF of 12, 22 and 28 are the next:
1. Decompose all numbers into prime factors
| 12 | 2 |
| 6 | 2 |
| 3 | 3 |
| 1 |
| 22 | 2 |
| 11 | 11 |
| 1 |
| 28 | 2 |
| 14 | 2 |
| 7 | 7 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 12 | = | 22 . 3 |
| Prime factors of 22 | = | 2 . 11 |
| Prime factors of 28 | = | 22 . 7 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2
Common prime factors with the lowest exponent: 21
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 = 21 = 2
Also calculates the: