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:
- DECIMAL EQUIVALENT = PERCENTAGE ÷ 100
- PERCENTAGE = DECIMAL EQUIVALENT ✕ 100
- To find “a percentage of A”: multiply by the Decimal Equivalent
- To find “A as a percentage of B”: do A ÷ B to get Decimal Equivalent
Edexcel GCSE Maths Notes
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