Keystones — Cornerstone
Five GCSE retrieval questions · 7 October 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 93 + ? = 175
Answer: 82 -
2. Algebra
Solve: 5x = 20
Answer: x = 4 -
3. Geometry
Opposite = 9cm, hypotenuse = 10.4cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Find 37% of 395
Answer: 146.15 -
5. Statistics
Calculate the mean of: 23, 40, 26, 11, 16, 43
Answer: 26.5