Keystones — Cornerstone
Five GCSE retrieval questions · 6 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 503 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 28x + 24
Answer: 4(7x + 6) -
3. Geometry Speed, distance and time
A car travels at 50km/h for 2 hours. How far does it travel?
Answer: 100km -
4. Ratio Percentage increase and decrease
Increase 184 by 25%
Answer: 230 -
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