Keystones — Lintel
Five GCSE retrieval questions · 22 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.026 in standard form
Answer: 2.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.11cm -
4. Ratio Mixed ratio problems
Express the second part of 10:12 as a fraction in simplest form
Answer: 6⁄11 -
5. Statistics Mean
Calculate the mean of: 15, 12, 13, 33, 39, 34, 45, 28. Give your answer to 2 decimal places
Answer: 27.38