Keystones — Lintel
Five GCSE retrieval questions · 4 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00077
Answer: 7.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 39°. Find adjacent side
Answer: 16.3cm -
4. Ratio Mixed ratio problems
£168.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £96.00 -
5. Statistics Mean
Calculate the mean of: 28, 46, 13, 8, 43, 23, 33
Answer: 27.7