Keystones — Lintel
Five GCSE retrieval questions · 27 November 2014 · 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 - 17x + 66
Answer: (x - 6)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.12cm -
4. Ratio Mixed ratio problems
Divide 147 in the ratio 2:4:1
Answer: 42, 84 and 21 -
5. Statistics Mean
Calculate the mean of: 40, 38, 44, 21, 15, 20. Give your answer to 2 decimal places
Answer: 29.67