Keystones — Lintel
Five GCSE retrieval questions · 15 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000022 in standard form
Answer: 2.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.33cm -
4. Ratio Mixed ratio problems
Express the first part of 5:9 as a fraction in simplest form
Answer: 5⁄14 -
5. Statistics Mean
Calculate the mean of: 18, 20, 38, 15, 10, 43, 46. Give your answer to 2 decimal places
Answer: 27.14