Keystones — Lintel
Five GCSE retrieval questions · 22 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.04 in standard form
Answer: 4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.18cm -
4. Ratio Mixed ratio problems
Divide 117 in the ratio 2:4:3
Answer: 26, 52 and 39 -
5. Statistics Mean
Calculate the mean of: 22, 9, 22, 39, 42, 38, 41. Give your answer to 2 decimal places
Answer: 30.43