Question
Find Greatest Common Divisor of 12 and 15, using repeated division.
Answer
The GCD of given numbers is 3.
Explanation
Step 1 : Place the numbers inside division bar:.
| 12 | 15 |
Step 2 : Divide numbers by 3.
| 3 | 12 | 15 |
| 4 | 5 |
Step 3 : Number 4 and 5, cannot be divided any more. The GCD is:
This solution can be visualized using a Venn diagram.
0,0
12
15
3
2
2
5
The GCD equals the product of the numbers at the intersection.
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