Keystones — Cornerstone
Five GCSE retrieval questions · 24 September 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 6651 to 2 significant figures
Answer: 6700 -
2. Algebra Factorising into a single bracket
Factorise: 25x + 30
Answer: 5(5x + 6) -
3. Geometry Speed, distance and time
A car travels at 29km/h for 5 hours. How far does it travel?
Answer: 145km -
4. Ratio Percentage increase and decrease
Decrease 380 by 38%
Answer: 235.6 -
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