Keystones — Cornerstone
Five GCSE retrieval questions · 25 September 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 591 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 5x² + 9x
Answer: x(5x + 9) -
3. Geometry Speed, distance and time
A cyclist travels 385km in 7 hours. What is their average speed?
Answer: 55km/h -
4. Ratio Percentage increase and decrease
Decrease 307 by 11%
Answer: 273.23 -
5. Statistics Simple probability
A bag has 4 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 1⁄3