Find Greatest Common Divisor of 52, 78 and 130, using prime factorization.

Step 1 : Find prime factorization of each number.

$$\begin{aligned}52 =& 2\cdot2\cdot13\\[8pt]78 =& 2\cdot3\cdot13\\[8pt]130 =& 2\cdot5\cdot13\\[8pt]\end{aligned}$$

(view steps on how to factor 52, 78 and 130. )

Step 2 : Put a box around factors that are common for all numbers:

$$\begin{aligned}52 =& \color{blue}{\boxed{2}}\cdot2\cdot\color{red}{\boxed{13}}\\[8pt]78 =& \color{blue}{\boxed{2}}\cdot3\cdot\color{red}{\boxed{13}}\\[8pt]130 =& \color{blue}{\boxed{2}}\cdot5\cdot\color{red}{\boxed{13}}\\[8pt]\end{aligned}$$

Step 3 : Multiply the boxed numbers together:

$$ GCD = 2\cdot13 = 26 $$

This solution can be visualized using a Venn diagram.

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

GCD Calculator