equivalent fractions
Two fractions are equivalent when they express the same part of a unit or when they have the same value.
For example:


We can test if two fractions are equivalent by crossmultiplying their numerators and denominators. This is also called taking the crossproduct:
If you multiply or divide the numerator and the denominator of a fraction by the same number, except zero, you obtain one equivalent fraction.
To simplify:
 Decompose the numerator and the denominator
 Cross out the numbers that are repeated in the numerator and in the denominator
 If there’s no number in the numerator, put 1
 At the end, you obtain the irreducible fraction equivalent to the first fraction
Exercise. Simplify the following fractions:
Licensed under the Creative Commons Attribution Noncommercial Share Alike 3.0 License