Keystones — Lintel
Five GCSE retrieval questions · 11 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000072 in standard form
Answer: 7.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 45°. Find opposite
Answer: 27cm -
4. Ratio Mixed ratio problems
In ratio 8:6:3, what fraction is the first part?
Answer: 8⁄17 -
5. Statistics Mean
Calculate the mean of: 5, 43, 30, 10, 12, 20, 21. Give your answer to 2 decimal places
Answer: 20.14