Keystones — Lintel
Five GCSE retrieval questions · 11 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 43,000,000 in standard form
Answer: 4.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
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
Black, white and yellow counters are in the ratio 9:8:1. What fraction of the counters are black?
Answer: 1⁄2 -
5. Statistics Mean
Calculate the mean of: 15, 25, 5, 39, 18, 35, 24
Answer: 23