Keystones — Cornerstone
Five GCSE retrieval questions · 9 August 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 309 to 1 significant figure
Answer: 300 -
2. Algebra Factorising into a single bracket
Factorise: 24x + 20
Answer: 4(6x + 5) -
3. Geometry Speed, distance and time
A car travels at 69km/h for 4 hours. How far does it travel?
Answer: 276km -
4. Ratio Percentage increase and decrease
Increase 159 by 20%
Answer: 190.8 -
5. Statistics Simple probability
What is the probability of rolling a 5 on a fair die?
Answer: 1⁄6