Keystones — Cornerstone
Five GCSE retrieval questions · 26 September 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 1539 to 2 significant figures
Answer: 1500 -
2. Algebra Factorising into a single bracket
Factorise: 5x² + 7x
Answer: x(5x + 7) -
3. Geometry Speed, distance and time
A car travels at 66km/h for 4 hours. How far does it travel?
Answer: 264km -
4. Ratio Percentage increase and decrease
Decrease 334 by 37%
Answer: 210.42 -
5. Statistics Simple probability
A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 7⁄13