Keystones — Lintel
Five GCSE retrieval questions · 27 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 98,000,000 in standard form
Answer: 9.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Express the first part of 5:14 as a fraction in simplest form
Answer: 5⁄19 -
5. Statistics Mean
Calculate the mean of: 45, 30, 9, 16, 31, 43
Answer: 29