Keystones — Lintel
Five GCSE retrieval questions · 29 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000015 in standard form
Answer: 1.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 120
Answer: (x + 12)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.59cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 1:2:4
Answer: 10, 20 and 40 -
5. Statistics Mean
Calculate the mean of: 22, 11, 46, 50, 12, 22, 30, 19
Answer: 26.5