Keystones — Lintel
Five GCSE retrieval questions · 10 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000078 in standard form
Answer: 7.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.37cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 2:9. What fraction of the marbles are blue?
Answer: 9⁄11 -
5. Statistics Mean
Calculate the mean of: 46, 48, 50, 44, 29, 49. Give your answer to 2 decimal places
Answer: 44.33