Find Greatest Common Divisor of 21, 45, 9 and 81, by listing out the factors.
Answer
The GCD of given numbers is 3.
Explanation
| factors of 21 are : | 1 , 3 , 7 , 21 |
| factors of 45 are : | 1 , 3 , 5 , 9 , 15 , 45 |
| factors of 9 are : | 1 , 3 , 9 |
| factors of 81 are : | 1 , 3 , 9 , 27 , 81 |
We see that the Greatest Common Factor = 3.
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