How to Pass Numerical Reasoning (12 page)

Now add the numberators, and reduce the improper fraction to its lowest terms:

Adding fractions: practice drill

Set a stopwatch and aim to complete the following drill in three minutes.

Subtracting fractions

Subtracting fractions with the same denominator

Worked example

To subtract fractions with the same denominators, simply subtract the numerators.

Subtracting fractions with different denominators

Worked example

To subtract fractions with different denominators, first find the lowest common denominator.

The lowest common denominator of 3 and 5 = (3 × 5) = 15, so set the fractions up with a common denominator of 15: