Keystones — Lintel
Five GCSE retrieval questions · 25 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 16,000,000 in standard form
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 11.47cm -
4. Ratio Mixed ratio problems
Divide 52 in the ratio 1:1:2
Answer: 13, 13 and 26 -
5. Statistics Mean
Calculate the mean of: 14, 15, 10, 18, 12, 20, 17, 25. Give your answer to 2 decimal places
Answer: 16.38