Keystones — Lintel
Five GCSE retrieval questions · 18 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000061 in standard form
Answer: 6.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 26.15cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 1:3:2
Answer: 24, 72 and 48 -
5. Statistics Mean
Calculate the mean of: 18, 36, 7, 31, 40, 49, 48. Give your answer to 2 decimal places
Answer: 32.71