The GCD of given numbers is 28.
Step 1 :
Divide $ 84 $ by $ 28 $ and get the remainder
The remainder is zero => GCD is the last divisor $ \color{blue}{ \boxed { 28 }} $.
We can summarize an algorithm into a following table.
84 | : | 28 | = | 3 | remainder ( 0 ) |
GCD = 28 |
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.