Keystones — Lintel
Five GCSE retrieval questions · 21 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0038 in standard form
Answer: 3.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 96
Answer: (x - 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 28.29cm -
4. Ratio Mixed ratio problems
Divide 140 in the ratio 3:3:4
Answer: 42, 42 and 56 -
5. Statistics Mean
Calculate the mean of: 31, 12, 19, 34, 28, 16, 9. Give your answer to 2 decimal places
Answer: 21.29