Keystones — Cornerstone
Five GCSE retrieval questions · 16 June 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 564 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 15x + 21
Answer: 3(5x + 7) -
3. Geometry Speed, distance and time
A car travels at 71km/h for 5 hours. How far does it travel?
Answer: 355km -
4. Ratio Percentage increase and decrease
Increase 173 by 20%
Answer: 207.6 -
5. Statistics Simple probability
A bag has 5 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 5⁄12