Keystones — Capstone
Five GCSE retrieval questions · 16 April 2026 · mathsvault.uk/keystones
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1. Number Error intervals
98 is rounded to the nearest integer. What is the error interval?
Answer: 97.5 ≤ x < 98.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 32 and 3x - y = 4
Answer: x = 4, y = 8 -
3. Geometry Distance between two points
Find the distance between (-8, 2) and (6, 6)
Answer: 14.56 -
4. Ratio Repeated percentage change
A car worth £5,163.00 depreciates by 25% each year for 4 years. What is it worth after 4 years?
Answer: £1,633.61 -
5. Statistics Expected frequency
A bag has 2 red out of 9 balls. If you pick 65 times (with replacement), how many times would you expect red?
Answer: 14.4