Keystones — Cornerstone
Five GCSE retrieval questions · 19 January 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 1840 to 2 significant figures
Answer: 1800 -
2. Algebra Factorising into a single bracket
Factorise: 2x² + 5x
Answer: x(2x + 5) -
3. Geometry Speed, distance and time
A car travels at 27km/h for 2 hours. How far does it travel?
Answer: 54km -
4. Ratio Percentage increase and decrease
Increase 176 by 20%
Answer: 211.2 -
5. Statistics Simple probability
A bag has 4 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 1⁄3