Keystones — Lintel
Five GCSE retrieval questions · 21 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0005 in standard form
Answer: 5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 42.84cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 1:1:4
Answer: 15, 15 and 60 -
5. Statistics Mean
Calculate the mean of: 30, 26, 24, 20, 13, 36. Give your answer to 2 decimal places
Answer: 24.83