Keystones — Capstone
Five GCSE retrieval questions · 28 October 2026 · mathsvault.uk/keystones
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1. Number Error intervals
94 is rounded to the nearest integer. What is the error interval?
Answer: 93.5 ≤ x < 94.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 34 and 3x - y = 7
Answer: x = 5, y = 8 -
3. Geometry Distance between two points
Find the distance between (-5, 0) and (3, 6)
Answer: 10 -
4. Ratio Repeated percentage change
A car worth £5,812.00 depreciates by 13% each year for 4 years. What is it worth after 4 years?
Answer: £3,329.68 -
5. Statistics Expected frequency
A bag has 5 red out of 11 balls. If you pick 112 times (with replacement), how many times would you expect red?
Answer: 50.9