Step 1 :
Divide $ 132223 $ by $ 11011 $ and get the remainder

$$ 132223 : 11011 = 12 \text{ ( remainder is } \color{blue}{ 91 } \text{ ) } $$

The remainder is positive ($ 91 > 0 $), so we will continue with division.

Step 2 :
Divide $ 11011 $ by $ \color{blue}{ 91 } $ and get the remainder

$$ 11011 : \color{blue}{ \boxed { 91 }} = 121 \text{ ( remainder is } \color{blue}{ 0 } \text{ ) } $$

The remainder is zero => GCD is the last divisor $ \color{blue}{ \boxed { 91 }} $.

This solution can be visualized using a Venn diagram.

The GCD equals the product of the numbers at the intersection.

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