# Visual GCD

- Author:
- David Radcliffe

- Topic:
- Algebra, LCM and GCD

This worksheet demonstrates a visual algorithm for computing the greatest common divisor of two numbers. At each step, we cut off the largest possible square from the top right corner, until the shape that remains is a square. The side length of the final square is the greatest common divisor of the side lengths. Can you see why this works?