Keystones — Capstone
Five GCSE retrieval questions · 4 June 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 = 38 and 3x - y = 24
Answer: x = 10, y = 6 -
3. Geometry Distance between two points
Find the distance between (-7, -3) and (8, 4)
Answer: 16.55 -
4. Ratio Repeated percentage change
A car worth £13,714.00 depreciates by 22% each year for 4 years. What is it worth after 4 years?
Answer: £5,076.24 -
5. Statistics Expected frequency
A bag has 3 red out of 11 balls. If you pick 147 times (with replacement), how many times would you expect red?
Answer: 40.1