The GCD of given numbers is 25.
Step 1 : Find prime factorization of each number.
$$\begin{aligned}6175 =& 5\cdot5\cdot13\cdot19\\[8pt]10000 =& 2\cdot2\cdot2\cdot2\cdot5\cdot5\cdot5\cdot5\\[8pt]\end{aligned}$$(view steps on how to factor 6175 and 10000. )
Step 2 : Put a box around factors that are common for all numbers:
$$\begin{aligned}6175 =& \color{blue}{\boxed{5}}\cdot\color{red}{\boxed{5}}\cdot13\cdot19\\[8pt]10000 =& 2\cdot2\cdot2\cdot2\cdot\color{blue}{\boxed{5}}\cdot\color{red}{\boxed{5}}\cdot5\cdot5\\[8pt]\end{aligned}$$Step 3 : Multiply the boxed numbers together:
$$ GCD = 5\cdot5 = 25 $$This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.