Keystones — Lintel
Five GCSE retrieval questions · 17 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000043 in standard form
Answer: 4.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 77
Answer: (x - 7)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 20.99cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
Calculate the mean of: 16, 6, 47, 34, 49, 36, 29, 27
Answer: 30.5