The GCD of given numbers is 40.
Step 1 :
Divide $ 5040 $ by $ 1000 $ and get the remainder
The remainder is positive ($ 40 > 0 $), so we will continue with division.
Step 2 :
Divide $ 1000 $ by $ \color{blue}{ 40 } $ and get the remainder
The remainder is zero => GCD is the last divisor $ \color{blue}{ \boxed { 40 }} $.
We can summarize an algorithm into a following table.
5040 | : | 1000 | = | 5 | remainder ( 40 ) | ||
1000 | : | 40 | = | 25 | remainder ( 0 ) | ||
GCD = 40 |
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.