Keystones — Lintel
Five GCSE retrieval questions · 25 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.032 in standard form
Answer: 3.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 45
Answer: (x + 9)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 45°. Find opposite
Answer: 19cm -
4. Ratio Mixed ratio problems
Express the first part of 15:4 as a fraction in simplest form
Answer: 15⁄19 -
5. Statistics Mean
Calculate the mean of: 17, 41, 14, 41, 31, 20. Give your answer to 2 decimal places
Answer: 27.33