First factor the numerator and denominator.
\25 = 5 · 5 \ \
\100 = 2 · 2 · 5 · 5
\The GCF is the product of the common prime factors in each term.
\GCF = 5 · 5 = 25 \ \
\Divide the numerator and the denominator by GCF.
\ (Divide)
Simpliest form of the fraction is
.