Keystones — Cornerstone
Five GCSE retrieval questions · 3 May 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 1815 to 2 significant figures
Answer: 1800 -
2. Algebra Factorising into a single bracket
Factorise: 12x + 21
Answer: 3(4x + 7) -
3. Geometry Speed, distance and time
A cyclist travels 153km in 4 hours. What is their average speed?
Answer: 38.25km/h -
4. Ratio Percentage increase and decrease
Decrease 351 by 38%
Answer: 217.62 -
5. Statistics Simple probability
A bag has 8 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 8⁄15