Keystones — Lintel
Five GCSE retrieval questions · 10 April 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 72 + ? = 113
Answer: 41 -
2. Algebra
Factorise: 2x² + 4x
Answer: 2x(x + 2) -
3. Geometry
Find c if a = 9cm and b = 20cm in a right triangle
Answer: 21.9cm -
4. Ratio
Find 70% of 56
Answer: 39.2 -
5. Statistics
Calculate the mean of: 22, 7, 40, 34, 37, 16, 28, 37
Answer: 27.6