Keystones — Lintel
Five GCSE retrieval questions · 24 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000087 in standard form
Answer: 8.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 24
Answer: (x + 12)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 34.95cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 850g
Answer: 60:17 -
5. Statistics Mean
Calculate the mean of: 10, 41, 30, 21, 18, 38, 6. Give your answer to 2 decimal places
Answer: 23.43