Keystones — Lintel
Five GCSE retrieval questions · 22 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,100,000 in standard form
Answer: 4.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 12.87cm -
4. Ratio Mixed ratio problems
Simplify: 15:9:9
Answer: 5:3:3 -
5. Statistics Mean
Calculate the mean of: 18, 12, 10, 50, 13, 21, 13, 10. Give your answer to 2 decimal places
Answer: 18.38