The GCD of given numbers is 5.
Step 1 : Place the numbers inside division bar:.
| 100 | 5 |
Step 2 : Divide numbers by 5.
| 5 | 100 | 5 |
| 20 | 1 |
Step 3 : Number 20 and 1, cannot be divided any more. The GCD is:
$$ GCD = 5 $$This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.