Keystones — Lintel
Five GCSE retrieval questions · 31 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000037 in standard form
Answer: 3.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 28.4cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:12
Answer: 5:6:3 -
5. Statistics Mean
Calculate the mean of: 5, 39, 11, 42, 38, 42
Answer: 29.5