Keystones — Lintel
Five GCSE retrieval questions · 29 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.073 in standard form
Answer: 7.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 108
Answer: (x + 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.82cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 4:7. What fraction of the counters are blue?
Answer: 7⁄11 -
5. Statistics Mean
Calculate the mean of: 31, 29, 5, 36, 35, 16, 44, 31. Give your answer to 2 decimal places
Answer: 28.38