GCF for 78 and 86

What is the Greatest Common Factor of 78 and 86?

Answer: GCF of 78 and 86 is 2

(Two)

Finding GCF for 78 and 86 using all factors (divisors) listing

The first method to find GCF for numbers 78 and 86 is to list all factors for both numbers and pick the highest common one:

All factors of 78: 1, 2, 3, 6, 13, 26, 39, 78

All factors of 86: 1, 2, 43, 86

So the Greatest Common Factor for 78 and 86 is 2

Finding GCF for 78 and 86 by Prime Factorization

The second method to find GCF for numbers 78 and 86 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 78: 2, 3, 13

All Prime Factors of 86: 2, 43

As we can see there is only one Prime Factor common to both numbers. It is 2

So 2 is the Greatest Common Factor of 78 and 86

GCF Table

Number 1Number 2GCF
63861
64862
65861
66862
67861
68862
69861
70862
71861
72862
73861
74862
75861
76862
77861
78862
79861
80862
81861
82862
83861
84862
85861
868686
87861
88862
89861
90862
91861
92862

About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Factor of 78 and 86? (The answer is: 2). Select the first number (e.g. '78') and the second number (e.g. '86'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder

FAQ

What is the Greatest Common Factor of 78 and 86?

GCF of 78 and 86 is 2