Keystones — Lintel
Five GCSE retrieval questions · 27 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00005 in standard form
Answer: 5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.14cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 8:5. What fraction of the counters are blue?
Answer: 5⁄13 -
5. Statistics Mean
Calculate the mean of: 23, 23, 35, 17, 25, 17, 22, 49. Give your answer to 2 decimal places
Answer: 26.38