Keystones — Lintel
Five GCSE retrieval questions · 6 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 86,000,000 in standard form
Answer: 8.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.86cm -
4. Ratio Mixed ratio problems
Divide 72 in the ratio 2:1:3
Answer: 24, 12 and 36 -
5. Statistics Mean
Calculate the mean of: 28, 36, 12, 12, 15, 18. Give your answer to 2 decimal places
Answer: 20.17