Keystones — Cornerstone
Five GCSE retrieval questions · 14 March 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 2226 to 2 significant figures
Answer: 2200 -
2. Algebra Factorising into a single bracket
Factorise: 5x² + 4x
Answer: x(5x + 4) -
3. Geometry Speed, distance and time
A cyclist travels 388km in 6 hours. What is their average speed?
Answer: 64.666666666667km/h -
4. Ratio Percentage increase and decrease
Increase 81 by 20%
Answer: 97.2 -
5. Statistics Simple probability
A bag has 3 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 3⁄10