Mathematics
Ratio & Proportion
Procedural
12–14 yrs
Percentages (age 12+)
百分数（12岁以上）
Description
Solve problems involving percentage increase, percentage decrease, finding the original value after a percentage change, and calculating simple interest
Mastery Evidence
- 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 your child 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?
