Keystones — Cornerstone
Five GCSE retrieval questions · 28 February 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 21 + 79
Answer: 21 + 79 = 100 -
2. Algebra
Solve: x + 4 = 16
Answer: x = 12 -
3. Geometry
Opposite = 15cm, adjacent = 19cm. Calculate the angle
Answer: 38.3° -
4. Ratio
Simplify the ratio 16:20
Answer: 4:5 -
5. Statistics
Calculate the mean of: 43, 33, 31, 6, 19, 49, 34
Answer: 30.7