The GCD of given numbers is 37.
Step 1 : Find prime factorization of each number.
$$\begin{aligned}74 =& 2\cdot37\\[8pt]37 =& 37\\[8pt]\end{aligned}$$(view steps on how to factor 74 and 37. )
Step 2 : Put a box around factors that are common for all numbers:
$$\begin{aligned}74 =& 2\cdot\color{blue}{\boxed{37}}\\[8pt]37 =& \color{blue}{\boxed{37}}\\[8pt]\end{aligned}$$Step 3 : Multiply the boxed numbers together:
$$ GCD = 37 $$This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.