Keystones — Lintel
Five GCSE retrieval questions · 7 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.045 in standard form
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 44
Answer: (x + 4)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 14.28cm -
4. Ratio Mixed ratio problems
Simplify: 9:18:6
Answer: 3:6:2 -
5. Statistics Mean
Calculate the mean of: 28, 38, 49, 16, 23, 12. Give your answer to 2 decimal places
Answer: 27.67