Keystones — Cornerstone
Five GCSE retrieval questions · 2 May 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 415 to 1 significant figure
Answer: 400 -
2. Algebra Factorising into a single bracket
Factorise: 8x² + 6x
Answer: 2x(4x + 3) -
3. Geometry Speed, distance and time
A car travels at 21km/h for 3 hours. How far does it travel?
Answer: 63km -
4. Ratio Percentage increase and decrease
Decrease 375 by 30%
Answer: 262.5 -
5. Statistics Simple probability
A bag has 3 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 1⁄3