Question
Find Greatest Common Divisor of 81 and 36, by listing out the factors.
Answer
The GCD of given numbers is 9.
Explanation
| factors of 81 are : | 1 , 3 , 9 , 27 , 81 |
| factors of 36 are : | 1 , 2 , 3 , 4 , 6 , 9 , 12 , 18 , 36 |
We see that the Greatest Common Factor = 9.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.
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