Keystones — Lintel
Five GCSE retrieval questions · 3 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.099 in standard form
Answer: 9.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 40
Answer: (x + 8)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 9.38cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:12
Answer: 1:1:2 -
5. Statistics Mean
Calculate the mean of: 39, 5, 17, 8, 28, 21, 17, 12. Give your answer to 2 decimal places
Answer: 18.38