Keystones — Lintel
Five GCSE retrieval questions · 18 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 99,000,000 in standard form
Answer: 9.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 8.09cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 5:6. What fraction of the marbles are white?
Answer: 6⁄11 -
5. Statistics Mean
Calculate the mean of: 16, 44, 20, 44, 11, 22, 8, 37
Answer: 25.25