Keystones — Lintel
Five GCSE retrieval questions · 19 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000013 in standard form
Answer: 1.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 60
Answer: (x + 12)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 45°. Find opposite
Answer: 20cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 3:3:2
Answer: 45, 45 and 30 -
5. Statistics Mean
Calculate the mean of: 6, 20, 40, 43, 25, 9, 22, 20. Give your answer to 2 decimal places
Answer: 23.13