Question
Find Greatest Common Divisor of 4 and 20, by listing out the factors.
Answer
The GCD of given numbers is 4.
Explanation
| factors of 4 are : | 1 , 2 , 4 |
| factors of 20 are : | 1 , 2 , 4 , 5 , 10 , 20 |
We see that the Greatest Common Factor = 4.
This solution can be visualized using a Venn diagram.
0,0
4
20
2
2
5
The GCD equals the product of the numbers at the intersection.
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