Calculate the Greatest Common Factor or GCF of 78

The instructions to find the GCF of 78 are the next:

1. Decompose all numbers into prime factors

2. Write all numbers as the product of its prime factors

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2 , 3 , 13

Common prime factors with the lowest exponent: 2¹, 3¹, 13¹

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. 3¹. 13¹ = 78

Also calculates the:

↑ Back to top