Keystones — Cornerstone
Five GCSE retrieval questions · 9 March 2026 · mathsvault.uk/keystones
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1. Number Rounding to significant figures
Round 965 to 1 significant figure
Answer: 900 -
2. Algebra Factorising into a single bracket
Factorise: 9x² + 9x
Answer: 9x(x + 1) -
3. Geometry Speed, distance and time
A cyclist travels 125km in 8 hours. What is their average speed?
Answer: 15.625km/h -
4. Ratio Percentage increase and decrease
Decrease 136 by 18%
Answer: 111.52 -
5. Statistics Simple probability
A bag has 7 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 7⁄15