Keystones — Lintel
Five GCSE retrieval questions · 6 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000022 in standard form
Answer: 2.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.09cm -
4. Ratio Mixed ratio problems
Divide 230 in the ratio 3:3:4
Answer: 69, 69 and 92 -
5. Statistics Mean
Calculate the mean of: 14, 8, 41, 45, 41, 43, 31, 49
Answer: 34