Keystones — Lintel
Five GCSE retrieval questions · 27 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000071 in standard form
Answer: 7.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 43.12cm -
4. Ratio Mixed ratio problems
Express the second part of 11:12 as a fraction in simplest form
Answer: 12⁄23 -
5. Statistics Mean
Calculate the mean of: 9, 27, 32, 49, 20, 17, 9, 6. Give your answer to 2 decimal places
Answer: 21.13