Keystones — Capstone
Five GCSE retrieval questions · 1 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
63 is rounded to the nearest integer. What is the error interval?
Answer: 62.5 ≤ x < 63.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 37 and 3x - y = 17
Answer: x = 8, y = 7 -
3. Geometry Distance between two points
Find the distance between (-5, -2) and (4, 7)
Answer: 12.73 -
4. Ratio Repeated percentage change
A car worth £17,061.00 depreciates by 22% each year for 4 years. What is it worth after 4 years?
Answer: £6,315.14 -
5. Statistics Expected frequency
A bag has 2 red out of 14 balls. If you pick 96 times (with replacement), how many times would you expect red?
Answer: 13.7