Keystones — Lintel
Five GCSE retrieval questions · 5 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000087 in standard form
Answer: 8.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 30
Answer: (x + 6)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.26cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 2:10:3. What fraction of the counters are white?
Answer: 2⁄3 -
5. Statistics Mean
Calculate the mean of: 17, 12, 26, 43, 12, 34, 50. Give your answer to 2 decimal places
Answer: 27.71