Keystones — Lintel
Five GCSE retrieval questions · 15 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.034 in standard form
Answer: 3.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 7.14cm -
4. Ratio Mixed ratio problems
Express the first part of 11:12 as a fraction in simplest form
Answer: 11⁄23 -
5. Statistics Mean
Calculate the mean of: 19, 44, 36, 50, 27, 21, 38, 23
Answer: 32.25