Keystones — Cornerstone
Five GCSE retrieval questions · 20 January 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 359 to 1 significant figure
Answer: 300 -
2. Algebra Factorising into a single bracket
Factorise: 5x² + 9x
Answer: x(5x + 9) -
3. Geometry Speed, distance and time
A cyclist travels 153km in 5 hours. What is their average speed?
Answer: 30.6km/h -
4. Ratio Percentage increase and decrease
Increase 183 by 50%
Answer: 274.5 -
5. Statistics Simple probability
What is the probability of rolling a 6 on a fair die?
Answer: 1⁄6