Keystones — Cornerstone
Five GCSE retrieval questions · 18 June 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 42 + ? = 100
Answer: 58 -
2. Algebra
Factorise: 20x + 40
Answer: 5(4x + 8) -
3. Geometry
Opposite = 9cm, hypotenuse = 10.4cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Simplify the ratio 18:24
Answer: 3:4 -
5. Statistics
Calculate the mean of: 34, 16, 21, 16, 23, 28
Answer: 23