Keystones — Lintel
Five GCSE retrieval questions · 21 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 80,000,000 in standard form
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 40
Answer: (x + 10)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 18.12cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 12:12:1. What fraction of the counters are yellow?
Answer: 1⁄25 -
5. Statistics Mean
Calculate the mean of: 28, 37, 36, 18, 35, 23, 35. Give your answer to 2 decimal places
Answer: 30.29