Keystones — Cornerstone
Five GCSE retrieval questions · 25 January 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 502 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 40x + 15
Answer: 5(8x + 3) -
3. Geometry Speed, distance and time
A cyclist travels 381km in 5 hours. What is their average speed?
Answer: 76.2km/h -
4. Ratio Percentage increase and decrease
Decrease 178 by 14%
Answer: 153.08 -
5. Statistics Simple probability
A bag has 6 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 3⁄7