Keystones — Cornerstone
Five GCSE retrieval questions · 4 August 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 75 + ? = 107
Answer: 32 -
2. Algebra
Solve: x + 10 = 25
Answer: x = 15 -
3. Geometry
Opposite = 8cm, hypotenuse = 11.3cm. Find the angle
Answer: 45° (approximately) -
4. Ratio
Simplify: 12:18:9
Answer: 4:6:3 -
5. Statistics
Find the mean of: 7, 3, 5, 5, 4
Answer: 4.8