Keystones — Lintel
Five GCSE retrieval questions · 1 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.002 in standard form
Answer: 2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 9
Answer: (x - 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 45°. Find opposite
Answer: 28cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 3:11:7. What fraction of the marbles are orange?
Answer: 1⁄7 -
5. Statistics Mean
Calculate the mean of: 5, 41, 46, 48, 39, 35, 6. Give your answer to 2 decimal places
Answer: 31.43