Keystones — Capstone
Five GCSE retrieval questions · 20 July 2026 · mathsvault.uk/keystones
-
1. Number Error intervals
59 is rounded to the nearest integer. What is the error interval?
Answer: 58.5 ≤ x < 59.5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 31 and 3x - y = 8
Answer: x = 5, y = 7 -
3. Geometry Distance between two points
Find the distance between (2, -1) and (12, 3)
Answer: 10.77 -
4. Ratio Repeated percentage change
A car worth £7,304.00 depreciates by 10% each year for 5 years. What is it worth after 5 years?
Answer: £4,312.94 -
5. Statistics Expected frequency
A bag has 2 red out of 14 balls. If you pick 114 times (with replacement), how many times would you expect red?
Answer: 16.3