Keystones — Lintel
Five GCSE retrieval questions · 17 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 12,000,000 in standard form
Answer: 1.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 46.2cm -
4. Ratio Mixed ratio problems
Divide 270 in the ratio 4:3:3
Answer: 108, 81 and 81 -
5. Statistics Mean
Calculate the mean of: 10, 33, 16, 15, 24, 33, 48. Give your answer to 2 decimal places
Answer: 25.57