Keystones — Lintel
Five GCSE retrieval questions · 7 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 620,000,000 in standard form
Answer: 6.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 6
Answer: (x + 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 8.66cm -
4. Ratio Mixed ratio problems
Divide 100 in the ratio 1:2:2
Answer: 20, 40 and 40 -
5. Statistics Mean
Calculate the mean of: 8, 23, 47, 29, 11, 30, 33, 48. Give your answer to 2 decimal places
Answer: 28.63