Keystones — Cornerstone
Five GCSE retrieval questions · 21 January 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 6701 to 2 significant figures
Answer: 6700 -
2. Algebra Factorising into a single bracket
Factorise: 30x + 36
Answer: 6(5x + 6) -
3. Geometry Speed, distance and time
A car travels at 26km/h for 2 hours. How far does it travel?
Answer: 52km -
4. Ratio Percentage increase and decrease
Increase 199 by 50%
Answer: 298.5 -
5. Statistics Simple probability
A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 5⁄8