Keystones — Lintel
Five GCSE retrieval questions · 22 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.032 in standard form
Answer: 3.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 23.cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 8:3. What fraction of the marbles are white?
Answer: 3⁄11 -
5. Statistics Mean
Calculate the mean of: 15, 38, 50, 33, 7, 37, 29, 49
Answer: 32.25