Keystones — Lintel
Five GCSE retrieval questions · 10 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 810,000,000 in standard form
Answer: 8.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.19cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 9:7:6. What fraction of the counters are green?
Answer: 3⁄11 -
5. Statistics Mean
Calculate the mean of: 41, 43, 21, 5, 8, 50, 20, 18
Answer: 25.75