Keystones — Lintel
Five GCSE retrieval questions · 7 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000032 in standard form
Answer: 3.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 54
Answer: (x + 9)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 28.9cm -
4. Ratio Mixed ratio problems
£250.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £100.00 -
5. Statistics Mean
Calculate the mean of: 36, 13, 48, 46, 16, 16, 8. Give your answer to 2 decimal places
Answer: 26.14