Keystones — Lintel
Five GCSE retrieval questions · 31 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,800,000 in standard form
Answer: 2.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 45°. Find opposite
Answer: 14cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 900g
Answer: 20:3 -
5. Statistics Mean
Calculate the mean of: 12, 23, 40, 43, 44, 42, 33, 10. Give your answer to 2 decimal places
Answer: 30.88