Keystones — Cornerstone
Five GCSE retrieval questions · 4 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 539 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 2x² + 8x
Answer: 2x(x + 4) -
3. Geometry Speed, distance and time
A car travels at 79km/h for 4 hours. How far does it travel?
Answer: 316km -
4. Ratio Percentage increase and decrease
Increase 172 by 20%
Answer: 206.4 -
5. Statistics Simple probability
A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 2⁄5