Keystones — Lintel
Five GCSE retrieval questions · 29 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00028
Answer: 2.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 32°. Find opposite
Answer: 14.4cm -
4. Ratio Mixed ratio problems
£342.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £190.00 -
5. Statistics Mean
Calculate the mean of: 31, 48, 10, 15, 14, 46, 30, 14
Answer: 26