Keystones — Lintel
Five GCSE retrieval questions · 3 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.004
Answer: 4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 40°. Find adjacent side
Answer: 26.8cm -
4. Ratio Mixed ratio problems
£405.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £180.00 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 20, 39, 28, 40, what is the missing number?
Answer: 53