Keystones — Cornerstone
Five GCSE retrieval questions · 1 May 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 4908 to 2 significant figures
Answer: 4900 -
2. Algebra Factorising into a single bracket
Factorise: 5x² + 9x
Answer: x(5x + 9) -
3. Geometry Speed, distance and time
A cyclist travels 225km in 3 hours. What is their average speed?
Answer: 75km/h -
4. Ratio Percentage increase and decrease
Decrease 374 by 28%
Answer: 269.28 -
5. Statistics Simple probability
A bag has 7 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 7⁄11