\"\"

\

First factor the numerator and denominator.

\

21 = 3 · 7

\

24 = 2 · 2 · 2 · 3

\

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

\

GCF = 3

\

\"\"

\

Divide the numerator and the denominator by GCF.

\

\"\"

\

\"\"

\

\"\"

\

Simplifies form of the fraction \"\" is \"\".