Keystones — Lintel
Five GCSE retrieval questions · 21 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000071 in standard form
Answer: 7.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 17x + 72
Answer: (x + 9)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.98cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 1:4:11. What fraction of the counters are green?
Answer: 11⁄16 -
5. Statistics Mean
Calculate the mean of: 11, 37, 23, 46, 7, 11, 33, 49. Give your answer to 2 decimal places
Answer: 27.13