Keystones — Cornerstone
Five GCSE retrieval questions · 12 March 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 240 to 1 significant figure
Answer: 200 -
2. Algebra Factorising into a single bracket
Factorise: 15x + 40
Answer: 5(3x + 8) -
3. Geometry Speed, distance and time
A car travels at 49km/h for 3 hours. How far does it travel?
Answer: 147km -
4. Ratio Percentage increase and decrease
Decrease 275 by 39%
Answer: 167.75 -
5. Statistics Simple probability
What is the probability of getting heads when flipping a fair coin?
Answer: 1⁄2