Keystones — Lintel
Five GCSE retrieval questions · 14 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0053 in standard form
Answer: 5.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.71cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 2:10:5. What fraction of the counters are black?
Answer: 2⁄17 -
5. Statistics Mean
Calculate the mean of: 42, 17, 7, 34, 17, 32. Give your answer to 2 decimal places
Answer: 24.83