Calculate the Greatest Common Factor or GCF of 450 and 630
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The instructions to find the GCF of 450 and 630 are the next:
1. Decompose all numbers into prime factors
| 450 | 2 |
| 225 | 3 |
| 75 | 3 |
| 25 | 5 |
| 5 | 5 |
| 1 |
| 630 | 2 |
| 315 | 3 |
| 105 | 3 |
| 35 | 5 |
| 7 | 7 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 450 | = | 2 . 32 . 52 |
| Prime factors of 630 | = | 2 . 32 . 5 . 7 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3 , 5
Common prime factors with the lowest exponent: 21, 32, 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 = 21. 32. 51 = 90
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