Keystones — Cornerstone
Five GCSE retrieval questions · 12 August 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 39 + 43
Answer: 39 + 43 = 82 -
2. Algebra
Solve: x + 8 = 14
Answer: x = 6 -
3. Geometry
Opposite = 12cm, hypotenuse = 13.9cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Simplify the ratio 9:12
Answer: 3:4 -
5. Statistics
A bag has 8 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2