Keystones — Capstone
Five GCSE retrieval questions · 7 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
52 is rounded to the nearest integer. What is the error interval?
Answer: 51.5 ≤ x < 52.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 25 and 3x - y = 21
Answer: x = 8, y = 3 -
3. Geometry Distance between two points
Find the distance between (-5, -2) and (10, 4)
Answer: 16.16 -
4. Ratio Repeated percentage change
A car worth £5,205.00 depreciates by 10% each year for 3 years. What is it worth after 3 years?
Answer: £3,794.45 -
5. Statistics Expected frequency
A bag has 3 red out of 11 balls. If you pick 55 times (with replacement), how many times would you expect red?
Answer: 15