Keystones — Cornerstone
Five GCSE retrieval questions · 7 December 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 79 + ? = 169
Answer: 90 -
2. Algebra
Simplify: 8x + 7x
Answer: 15x -
3. Geometry
Opposite = 13cm, adjacent = 16cm. Calculate the angle
Answer: 39.1° -
4. Ratio
Simplify: 12:4:10
Answer: 6:2:5 -
5. Statistics
Calculate the mean of: 37, 9, 42, 29, 14, 11
Answer: 23.7