Keystones — Lintel
Five GCSE retrieval questions · 20 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.072 in standard form
Answer: 7.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.4cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 4:10. What fraction of the counters are black?
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 8, 12, 16, 30, 35, 50. Give your answer to 2 decimal places
Answer: 25.17