\"\"

\

First factor the numerator and denominator.

\

20 =  2 · 2 · 5

\

53 =  1 · 53

\

The GCF is the product of the common prime factors in each term.

\

GCF = 1

\

\"\"

\

Since GCF of the numerator and the denominator is 1, the fraction already in its simplest form. \"\"

\

Simplified.