Find Greatest Common Divisor of 21, 28 and 49, by listing out the factors.
Answer
The GCD of given numbers is 7.
Explanation
| factors of 21 are : | 1 , 3 , 7 , 21 |
| factors of 28 are : | 1 , 2 , 4 , 7 , 14 , 28 |
| factors of 49 are : | 1 , 7 , 49 |
We see that the Greatest Common Factor = 7.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.
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