Keystones — Lintel
Five GCSE retrieval questions · 24 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.063 in standard form
Answer: 6.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 15.63cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 7:2. What fraction of the counters are orange?
Answer: 7⁄9 -
5. Statistics Mean
Calculate the mean of: 31, 37, 16, 9, 31, 39, 16. Give your answer to 2 decimal places
Answer: 25.57