Keystones — Cornerstone
Five GCSE retrieval questions · 19 November 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 67 + ? = 183
Answer: 116 -
2. Algebra
Solve: x + 6 = 15
Answer: x = 9 -
3. Geometry
Calculate perimeter: two sides are 13cm and 9cm at right angles
Answer: 37.8cm -
4. Ratio
Find 27% of 213
Answer: 57.51 -
5. Statistics
Find the range of: 10, 17, 7, 21, 15
Answer: 14