Keystones — Lintel
Five GCSE retrieval questions · 15 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00021 in standard form
Answer: 2.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.63cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 2:2:3
Answer: 24, 24 and 36 -
5. Statistics Mean
Calculate the mean of: 17, 48, 41, 21, 21, 20, 18, 21. Give your answer to 2 decimal places
Answer: 25.88