Keystones — Lintel
Five GCSE retrieval questions · 21 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 150,000,000 in standard form
Answer: 1.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 36
Answer: (x + 9)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 24.14cm -
4. Ratio Mixed ratio problems
Simplify: 10:6:12
Answer: 5:3:6 -
5. Statistics Mean
Calculate the mean of: 25, 44, 47, 36, 28, 38, 45. Give your answer to 2 decimal places
Answer: 37.57