Keystones — Cornerstone
Five GCSE retrieval questions · 23 October 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 36 + ? = 173
Answer: 137 -
2. Algebra
Solve: 9x - 9 = 6x + -3
Answer: x = 2 -
3. Geometry
Opposite = 17cm, adjacent = 15cm. Calculate the angle
Answer: 48.6° -
4. Ratio
Simplify the ratio 6:9
Answer: 2:3 -
5. Statistics
Calculate the mean of: 45, 43, 18, 29, 16, 30
Answer: 30.2