# Math 209

posted by
**Jennifer** on
.

When simplifying a rational fraction, why do you need to factor the numerator and the denominator?

If there is a common factor in both the numerator and denominator, that factor will cancel, thus simplifying the fraction.

e.g.

15/18 = (3*5)/3*6)

=(3/3)*(5/6)

=(1)*5/6

=5/6