top of page
This topic finds percentages of amounts, expresses one quantity as a percentage of another, and covers percentage increase and decrease — the foundation of the percentages strand. It's examined right across GCSE and iGCSE Maths. Learn it free on eClassroom through guided worked examples and instantly-marked exam-style questions.
How you do it
Turn the percentage into a decimal multiplier and multiply. For an increase use 1 plus the decimal, for a decrease use 1 minus it — so a 15 percent rise is multiply by 1.15. Non-calculator, build the answer from 10 percent, 5 percent and 1 percent.
Before you start
Everything here rests on fractions and decimals. Assessed at Foundation and Higher tier. It then feeds into percentage change, interest and reverse percentages.
What you learn
Percentages are everywhere — discounts, interest, test scores. This lesson covers the three things examiners ask for most. To increase or decrease by a percentage, find the percentage then add or subtract it. The course works through percentage of an amount, increase and decrease and one number as a percentage of another. Every section has instant-feedback practice questions matched to Edexcel iGCSE 4MA1 and the other major GCSE boards, and the course finishes with full exam-style questions you mark yourself.
Related Topics
Percentages is a Number topic in the GCSE syllabus, covered here at Foundation tier. It runs to 3 concepts, each followed by a check, with 2 worked examples along the way. Students often pair it with Powers & Roots, Primes, Factors & Multiples, Primes & LCM / HCF, Primes & Proof and Product Rule for Counting. For unlimited practice, the Number revision engine builds new questions on demand and records your accuracy.
Still need help with a topic?
bottom of page