Keystones — Lintel
Five GCSE retrieval questions · 4 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00091 in standard form
Answer: 9.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 9.56cm -
4. Ratio Mixed ratio problems
Divide 78 in the ratio 2:3:1
Answer: 26, 39 and 13 -
5. Statistics Mean
Calculate the mean of: 37, 45, 25, 14, 37, 34, 48. Give your answer to 2 decimal places
Answer: 34.29