Keystones — Cornerstone
Five GCSE retrieval questions · 1 September 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 77 + ? = 174
Answer: 97 -
2. Algebra
Simplify: 8x + 8x
Answer: 16x -
3. Geometry
Opposite = 15cm, hypotenuse = 17.3cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Simplify: 6:12:18
Answer: 1:2:3 -
5. Statistics
Find the mean of: 7, 17, 10, 19
Answer: 13.25