Keystones — Lintel
Five GCSE retrieval questions · 23 April 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 57 + ? = 147
Answer: 90 -
2. Algebra
Factorise fully: 30x² + 20x
Answer: 5x(6x + 4) -
3. Geometry
Find c if a = 11cm and b = 18cm in a right triangle
Answer: 21.cm -
4. Ratio
Simplify: 8:8:12
Answer: 2:2:3 -
5. Statistics
Calculate the mean of: 43, 7, 47, 30, 35, 12
Answer: 29