Keystones — Cornerstone
Five GCSE retrieval questions · 5 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 2715 to 2 significant figures
Answer: 2700 -
2. Algebra Factorising into a single bracket
Factorise: 30x + 18
Answer: 6(5x + 3) -
3. Geometry Speed, distance and time
A cyclist travels 207km in 7 hours. What is their average speed?
Answer: 29.571428571429km/h -
4. Ratio Percentage increase and decrease
Increase 187 by 50%
Answer: 280.5 -
5. Statistics Simple probability
What is the probability of rolling a 4 on a fair die?
Answer: 1⁄6