Keystones — Cornerstone
Five GCSE retrieval questions · 7 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 8857 to 2 significant figures
Answer: 8900 -
2. Algebra Factorising into a single bracket
Factorise: 9x² + 7x
Answer: x(9x + 7) -
3. Geometry Speed, distance and time
A cyclist travels 313km in 3 hours. What is their average speed?
Answer: 104.33333333333km/h -
4. Ratio Percentage increase and decrease
Increase 174 by 25%
Answer: 217.5 -
5. Statistics Simple probability
A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 5⁄8