Keystones — Lintel
Five GCSE retrieval questions · 9 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,400,000 in standard form
Answer: 1.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 12.17cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 12:8:12. What fraction of the marbles are yellow?
Answer: 3⁄8 -
5. Statistics Mean
Calculate the mean of: 28, 38, 32, 32, 23, 15
Answer: 28