Keystones — Lintel
Five GCSE retrieval questions · 24 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.045 in standard form
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 26.88cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 5:7:7. What fraction of the sweets are red?
Answer: 5⁄19 -
5. Statistics Mean
Calculate the mean of: 21, 27, 41, 11, 46, 43
Answer: 31.5