How To Work Out Reverse Percentages – GCSE mathematics

Simon

8 years ago

GCSE mathematics questions on how to work out reverse percentages appear on many exam papers and you can download the questions from here. They can be a little challenging and please do practice all of the problems – here’s the link to the answers.

The main things to remember when you are asked how to work out reverse questions are:

– Work out the value in its equivalent percentage. For instance £220 = 80%
– Change the percentage to a decimal and divide through
– Don’t get confused with working out 20% and then adding it! An example would be:

“I worked it out at £264

20% OF £100 =£20

20% OF £100=£20

20% OF £20=£4

£220 ADD £44 =£264”

You need to be a little careful with this. The question isn’t asking for £220 + 20% (in which case the calculation would be correct). The answer you’re looking for is a number that is 100%, not a value of 120%.

If you’d like to ask for any more detail, or you’re not sure about anything, please do ask a question in the comments section.

All best with your studies 🙂