Keystones — Cornerstone
Five GCSE retrieval questions · 26 December 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 888 + 293
Answer: 888 + 293 = 1181 -
2. Algebra
Factorise: 4x² + 2x
Answer: 2x(2x + 1) -
3. Geometry
Opposite = 8cm, hypotenuse = 16cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify: 12:20:16
Answer: 3:5:4 -
5. Statistics
Calculate the mean of: 15, 34, 8, 33, 40, 8, 8, 23
Answer: 21.1