Mathematics·Ratio & Proportion·procedural
Percentages (age 12+)
Solve problems involving percentage increase, percentage decrease, finding the original value after a percentage change, and calculating simple interest
Suggested ages 12–14
Evidence of understanding
- Calculate a 15% increase on £240 using a decimal multiplier (× 1.15)
- Find the original price before a 20% discount resulted in a sale price of £64
- Calculate simple interest on £500 at 3% per annum for 4 years
Assessment prompt
If a bike originally costs £250 and its price goes up by 8%, can Percentages (age 12+) work out the new price — and if a savings account earns 3% simple interest per year, how much interest would £500 earn in 4 years?
Standards alignment
7.RP.3US · ccss-math
Use proportional relationships to solve multistep ratio and percent problems
Common Core State Standards for Mathematics · 7
KS3.Maths.Ratio.8GB · uk-nc-2013
Percentage Change Problems
The national curriculum in England: Key stages 1 and 2 framework document · Key Stage 3