Keystones — Cornerstone
Five GCSE retrieval questions · 24 January 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 9778 to 2 significant figures
Answer: 9800 -
2. Algebra Factorising into a single bracket
Factorise: 3x² + 9x
Answer: 3x(x + 3) -
3. Geometry Speed, distance and time
A car travels at 55km/h for 3 hours. How far does it travel?
Answer: 165km -
4. Ratio Percentage increase and decrease
Decrease 195 by 17%
Answer: 161.85 -
5. Statistics Simple probability
A bag has 5 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 5⁄12