Keystones — Cornerstone
Five GCSE retrieval questions · 30 April 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 632 to 1 significant figure
Answer: 600 -
2. Algebra Factorising into a single bracket
Factorise: 32x + 28
Answer: 4(8x + 7) -
3. Geometry Speed, distance and time
A car travels at 27km/h for 5 hours. How far does it travel?
Answer: 135km -
4. Ratio Percentage increase and decrease
Decrease 446 by 24%
Answer: 338.96 -
5. Statistics Simple probability
A bag has 5 red and 5 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2