Keystones — Cornerstone
Five GCSE retrieval questions · 8 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 4309 to 2 significant figures
Answer: 4300 -
2. Algebra Factorising into a single bracket
Factorise: 3x² + 8x
Answer: x(3x + 8) -
3. Geometry Speed, distance and time
A cyclist travels 310km in 6 hours. What is their average speed?
Answer: 51.666666666667km/h -
4. Ratio Percentage increase and decrease
Increase 113 by 50%
Answer: 169.5 -
5. Statistics Simple probability
A bag has 3 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 3⁄11