Keystones — Lintel
Five GCSE retrieval questions · 18 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.019 in standard form
Answer: 1.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 38.4cm -
4. Ratio Mixed ratio problems
Divide 40 in the ratio 1:1:2
Answer: 10, 10 and 20 -
5. Statistics Mean
Calculate the mean of: 40, 44, 24, 19, 26, 28. Give your answer to 2 decimal places
Answer: 30.17