Keystones — Lintel
Five GCSE retrieval questions · 27 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000065 in standard form
Answer: 6.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 80
Answer: (x - 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 900 ml
Answer: 20:9 -
5. Statistics Mean
Calculate the mean of: 18, 9, 6, 8, 15, 37, 48, 28. Give your answer to 2 decimal places
Answer: 21.13