Keystones — Lintel
Five GCSE retrieval questions · 2 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00011
Answer: 1.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 53°. Find opposite
Answer: 18.6cm -
4. Ratio Mixed ratio problems
£135.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £54.00 -
5. Statistics Mean
Calculate the mean of: 42, 31, 30, 37, 35, 16, 19
Answer: 30