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Summary GCSE Maths Revision Notes Percentages – Clear Explanations, Worked Examples & Exam Tips (UK)

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Experienced UK tutor creating clear, structured Maths and Science revision notes for KS2, KS3 and GCSE students. UK curriculum aligned Easy-to-follow explanations Perfect for revision, homework support and exam prep All notes are designed to build confidence and understanding — not just memorisation.

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GCSE MATHS REVISION
NOTES
Foundation & higher | exam focused




What You Need to Know

Percentage increase and decrease means changing an original amount by a given percentage.



Key Rules

Rule 1: Increase → add a percentage
Rule 2: Decrease → subtract a percentage
Rule 3: Use a multiplier for calculator questions

Formula / Key Facts:

Increase by x% → × (1 + x/100)

Decrease by x% → × (1 − x/100)




Worked Example

A simple worked example illustrating the key concepts.

Question: Increase £40 by 10%

Solution: 10% = 0.1 (1 + 0.1)
New amount = 40 x 1.1 = £44

© Bright Sparks Tutoring – GCSE Maths Revision Notes – Personal Use Only



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1. Step 1: Identify increase or decrease
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