Keystones — Lintel
Five GCSE retrieval questions · 1 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.059 in standard form
Answer: 5.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 63
Answer: (x + 9)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 20.65cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 2:2:12. What fraction of the marbles are white?
Answer: 1⁄8 -
5. Statistics Mean
Calculate the mean of: 22, 22, 32, 31, 35, 38
Answer: 30