Keystones — Lintel
Five GCSE retrieval questions · 26 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 38,000,000 in standard form
Answer: 3.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 60°. Find adjacent side
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Divide 210 in the ratio 2:2:1
Answer: 84, 84 and 42 -
5. Statistics Mean
Calculate the mean of: 13, 44, 20, 33, 46, 46. Give your answer to 2 decimal places
Answer: 33.67