Keystones — Cornerstone
Five GCSE retrieval questions · 23 September 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 4260 to 2 significant figures
Answer: 4300 -
2. Algebra Factorising into a single bracket
Factorise: 10x + 16
Answer: 2(5x + 8) -
3. Geometry Speed, distance and time
A car travels at 42km/h for 4 hours. How far does it travel?
Answer: 168km -
4. Ratio Percentage increase and decrease
Increase 128 by 20%
Answer: 153.6 -
5. Statistics Simple probability
A bag has 6 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 3⁄7