From the basics through to reverse percentages.
- Relating percentages to fractions. Making a given percentage of a whole number. For example, 10% of 30.
- How to calculate discounts. For example, a £12.00 bill discounted by 20% (answer £9.60).
We often work out what percentage number 1 is of number 2. It helps us see quickly what the relative difference in their size is.
- How to calculate percentage change including percentage profit.
When you are given the answer to a percentage related calculation, you sometimes need to work backwards to find the original numbers used.
- In many situations the same percentage change has to be calculated several times, one after the other. This shows the methods needed.