Keystones — Cornerstone
Five GCSE retrieval questions · 24 February 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 59 + ? = 172
Answer: 113 -
2. Algebra
Simplify: 7x + 5x
Answer: 12x -
3. Geometry
Opposite = 14cm, hypotenuse = 19.8cm. Find the angle
Answer: 45° (approximately) -
4. Ratio
Calculate 50% of 82
Answer: 41 -
5. Statistics
Calculate the mean of: 42, 38, 32, 42, 18, 13, 11, 21
Answer: 27.1