First factor the numerator and denominator.
\3 = 1 · 3 \ \
\18 = 2 · 3 · 3
\The GCF is the product of the common prime factors in each term.
\GCF = 3 \ \
\
Divide the numerator and the denominator by GCF.
\ (Simplify)
\
Simplifest form of the fraction is
.