Revise how to add, subtract, multiply and divide fractions, how to use a calculator for fractions and how to find fractions of amounts in this GCSE maths guide.

The common denominator model, while not really a picture, demonstrates that the same rules apply to multiplication and division with fractions. It also shows why “invert and multiply” works.

When you are dividing fractions by a whole number, you just have to remember to divide the numerator by the whole number. The denominator will stay the same. Let’s look at an example. Imagine ...