The GCD of given numbers is 10.
factors of 30 are : | 1 , 2 , 3 , 5 , 6 , 10 , 15 , 30 |
factors of 40 are : | 1 , 2 , 4 , 5 , 8 , 10 , 20 , 40 |
We see that the Greatest Common Factor = 10.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.