Keystones — Lintel
Five GCSE retrieval questions · 8 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.069 in standard form
Answer: 6.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x + 5
Answer: (x + 5)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 17.26cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 3:2:2
Answer: 81, 54 and 54 -
5. Statistics Mean
Calculate the mean of: 6, 18, 50, 42, 37, 36, 23. Give your answer to 2 decimal places
Answer: 30.29