Revision Notes

What is a percentage?

“Per-cent” simply means “ ÷ 100” (or “out of 100”)

You can think of a percentage as a standardised way of expressing a fraction – by always expressing is “out of 100”. That means it is a useful way of comparing fractions.

e.g. ½ = 50% (yes – they really are equal – 50% means 50 ÷ 100)
⅖ = 40%
¾ = 75%

Things to remember:

  1. DECIMAL EQUIVALENT = PERCENTAGE ÷ 100
  2. PERCENTAGE = DECIMAL EQUIVALENT ✕ 100
  3. To find “a percentage of A”: multiply by the Decimal Equivalent
  4. To find “A as a percentage of B”: do A ÷ B to get Decimal Equivalent

Example

1.3.1 Percentages Example, IGCSE & GCSE Maths revision notes

Question

Need help?

Edexcel GCSE Maths Notes

Want to aim for a Level 9?

See if you’ve got what it takes. Test yourself with our topic questions.

Author: Simon

After 24 years teaching A Level Further Maths, Maths whizz Simon focused his attention on tutoring. He’s helped thousands of young people make sense of Maths and now he’s helping you too – aren’t you lucky! He’s even worked as an Edexcel examiner, so knows exactly what they’re looking for.