Keystones — Lintel
Five GCSE retrieval questions · 3 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000099 in standard form
Answer: 9.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 20.26cm -
4. Ratio Mixed ratio problems
Divide 270 in the ratio 3:4:3
Answer: 81, 108 and 81 -
5. Statistics Mean
Calculate the mean of: 14, 29, 26, 50, 15, 30, 27, 13
Answer: 25.5