Simplify the fraction to lowest terms.

Simplify (or reduce) a fraction to lowest terms by dividing both the *numerator* and the *denominator* by the greatest common denominator (GCD).

If you would like to have a vivid explanation with a detailed example, please read the page Simplifying/Reducing Fractions - Learn this magic trick!

**Step 1: Calculate the greatest common divisor (GCD):**

20 ÷ 100 = 0 Remainder 20

100 ÷ 20 = 5 Remainder 0

The Greatest Common Divisor (GCD) of 20 and 100 is **20**.

**Step 2: Simplifying by the greatest common divisor (GCD):**

Since the GCD is greater than 1, the fraction can be simplified directly to lowest terms by this number (20):

20 | = | 20 ÷ 20 | = | 1 |

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100 | 100 ÷ 20 | 5 |