Keystones — Cornerstone
Five GCSE retrieval questions · 18 June 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 8896 to 2 significant figures
Answer: 8900 -
2. Algebra Factorising into a single bracket
Factorise: 8x² + 3x
Answer: x(8x + 3) -
3. Geometry Speed, distance and time
A cyclist travels 143km in 8 hours. What is their average speed?
Answer: 17.875km/h -
4. Ratio Percentage increase and decrease
Increase 77 by 10%
Answer: 84.7 -
5. Statistics Simple probability
A bag has 5 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 5⁄9