It is also called simplifying the fraction. You often have to write a fraction in its simplest form. This means that you have to cancel it down until it cannot be cancelled down any more.

For example, 1/2÷3/4=1/2×4/3=2/3 Simplifying Fractions: Divide the numerator and the denominator by their greatest common factor (GCF) to express the fraction in its simplest form.