Keystones — Cornerstone
Five GCSE retrieval questions · 14 December 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 58 + ? = 142
Answer: 84 -
2. Algebra
Factorise: 5x² + 8x
Answer: x(5x + 8) -
3. Geometry
Opposite = 14cm, hypotenuse = 28cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify the ratio 6:4
Answer: 3:2 -
5. Statistics
Calculate the range of: 70, 58, 39, 70, 70, 103
Answer: 64