Keystones — Capstone
Five GCSE retrieval questions · 6 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
86 is rounded to the nearest integer. What is the error interval?
Answer: 85.5 ≤ x < 86.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 33 and 3x - y = 11
Answer: x = 6, y = 7 -
3. Geometry Distance between two points
Find the distance between (-1, -2) and (5, 5)
Answer: 9.22 -
4. Ratio Repeated percentage change
A car worth £16,942.00 depreciates by 14% each year for 3 years. What is it worth after 3 years?
Answer: £10,776.06 -
5. Statistics Expected frequency
A bag has 4 red out of 8 balls. If you pick 51 times (with replacement), how many times would you expect red?
Answer: 25.5