Keystones — Lintel
Five GCSE retrieval questions · 24 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 77,000 in standard form
Answer: 7.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 15.55cm -
4. Ratio Mixed ratio problems
Divide 60 in the ratio 1:2:1
Answer: 15, 30 and 15 -
5. Statistics Mean
Calculate the mean of: 21, 16, 32, 19, 44, 47, 18, 12. Give your answer to 2 decimal places
Answer: 26.13