Keystones — Lintel
Five GCSE retrieval questions · 28 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.017 in standard form
Answer: 1.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 28.81cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 11:2. What fraction of the counters are white?
Answer: 2⁄13 -
5. Statistics Mean
Calculate the mean of: 21, 14, 48, 44, 47, 47, 22. Give your answer to 2 decimal places
Answer: 34.71