Keystones — Lintel
Five GCSE retrieval questions · 28 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.073 in standard form
Answer: 7.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 900g
Answer: 20:9 -
5. Statistics Mean
Calculate the mean of: 27, 12, 8, 25, 16, 22, 5. Give your answer to 2 decimal places
Answer: 16.43