Keystones — Cornerstone
Five GCSE retrieval questions · 21 June 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 454 to 1 significant figure
Answer: 400 -
2. Algebra Factorising into a single bracket
Factorise: 4x² + 8x
Answer: 4x(x + 2) -
3. Geometry Speed, distance and time
A car travels at 34km/h for 3 hours. How far does it travel?
Answer: 102km -
4. Ratio Percentage increase and decrease
Increase 99 by 25%
Answer: 123.75 -
5. Statistics Simple probability
A bag has 4 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 4⁄7