Calculate the Greatest Common Factor or GCF of 1390
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The instructions to find the GCF of 1390 are the next:
1. Decompose all numbers into prime factors
1390 | 2 |
695 | 5 |
139 | 139 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 1390 | = | 2 . 5 . 139 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 5 , 139
Common prime factors with the lowest exponent: 21, 51, 1391
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. 51. 1391 = 1390
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