Keystones — Cornerstone
Five GCSE retrieval questions · 20 June 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 2699 to 2 significant figures
Answer: 2700 -
2. Algebra Factorising into a single bracket
Factorise: 10x + 6
Answer: 2(5x + 3) -
3. Geometry Speed, distance and time
A cyclist travels 109km in 6 hours. What is their average speed?
Answer: 18.166666666667km/h -
4. Ratio Percentage increase and decrease
Increase 56 by 20%
Answer: 67.2 -
5. Statistics Simple probability
A bag has 4 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2