Keystones — Lintel
Five GCSE retrieval questions · 11 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0071 in standard form
Answer: 7.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 15.26cm -
4. Ratio Mixed ratio problems
Express the first part of 4:8 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 34, 39, 37, 48, 20, 15, 40, 49
Answer: 35.25