Keystones — Cornerstone
Five GCSE retrieval questions · 15 March 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 74 + ? = 158
Answer: 84 -
2. Algebra
Solve: 3x = 21
Answer: x = 7 -
3. Geometry
Opposite = 11cm, hypotenuse = 22cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify: 4:8:12
Answer: 1:2:3 -
5. Statistics
Find the mean of: 13, 12, 2, 7
Answer: 8.5