Keystones — Lintel
Five GCSE retrieval questions · 5 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00036
Answer: 3.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 16
Answer: (x - 4)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 37°. Find adjacent side
Answer: 24.8cm -
4. Ratio Mixed ratio problems
£400.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £150.00 -
5. Statistics Mean
Calculate the mean of: 33, 35, 32, 41, 47, 47, 28
Answer: 37.6