Keystones — Cornerstone
Five GCSE retrieval questions · 20 June 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 84 + ? = 162
Answer: 78 -
2. Algebra
Collect like terms: 3x + 2y + 3x + 2y
Answer: 6x + 4y -
3. Geometry
Opposite = 11cm, hypotenuse = 12.7cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Simplify the ratio 10:12
Answer: 5:6 -
5. Statistics
Calculate the mean of: 23, 43, 21, 26, 7, 30
Answer: 25