Keystones — Capstone
Five GCSE retrieval questions · 26 July 2026 · mathsvault.uk/keystones
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1. Number Error intervals
20 is rounded to the nearest integer. What is the error interval?
Answer: 19.5 ≤ x < 20.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 35 and 3x - y = 14
Answer: x = 7, y = 7 -
3. Geometry Distance between two points
Find the distance between (1, 1) and (10, 10)
Answer: 12.73 -
4. Ratio Repeated percentage change
A car worth £11,690.00 depreciates by 24% each year for 5 years. What is it worth after 5 years?
Answer: £2,964.03 -
5. Statistics Expected frequency
A bag has 5 red out of 15 balls. If you pick 142 times (with replacement), how many times would you expect red?
Answer: 47.3