The Greatest Common Divisor of 78 and 81 is as follows:
3
To find the Greatest Common Divisor of 78 and 81, we first list all the divisors of 78
and all the divisors of 81. Then, we compare the two lists of divisors and pick the largest (greatest)
number that is on both lists, which will be the Greatest Common Divisor of 78 and 81.
Here is the list of 78 divisors: 1, 2, 3, 6, 13, 26, 39, 78
And here is the list of 81 divisors: 1, 3, 9, 27, 81
When we compare the two lists, we see that the greatest number they have in common is 3.
Therefore, once again, the answer to the question "What is the Greatest Common Divisor of 78 and 81?" is:
3
Note, the divisors of 78 are all the numbers you can divide into 78 with no remainder, and the divisors of 81 are
all the numbers you can divide into 81 with no remainder.
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