Keystones — Lintel
Five GCSE retrieval questions · 13 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00032 in standard form
Answer: 3.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 12.14cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
Calculate the mean of: 40, 6, 28, 44, 48, 33. Give your answer to 2 decimal places
Answer: 33.17