Keystones — Lintel
Five GCSE retrieval questions · 4 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,500,000 in standard form
Answer: 5.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.73cm -
4. Ratio Mixed ratio problems
Divide 91 in the ratio 2:4:1
Answer: 26, 52 and 13 -
5. Statistics Mean
Calculate the mean of: 34, 34, 42, 41, 8, 19, 14. Give your answer to 2 decimal places
Answer: 27.43