Keystones — Lintel
Five GCSE retrieval questions · 21 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00012 in standard form
Answer: 1.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 7.81cm -
4. Ratio Mixed ratio problems
Express the first part of 4:3 as a fraction in simplest form
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 18, 31, 10, 18, 40, 12, 16, 37
Answer: 22.75