Keystones — Cornerstone
Five GCSE retrieval questions · 19 June 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 514 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 25x + 15
Answer: 5(5x + 3) -
3. Geometry Speed, distance and time
A car travels at 23km/h for 3 hours. How far does it travel?
Answer: 69km -
4. Ratio Percentage increase and decrease
Increase 159 by 50%
Answer: 238.5 -
5. Statistics Simple probability
What is the probability of getting heads when flipping a fair coin?
Answer: 1⁄2