Keystones — Lintel
Five GCSE retrieval questions · 25 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0022 in standard form
Answer: 2.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 11
Answer: (x - 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 29.99cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 3:11:12. What fraction of the marbles are yellow?
Answer: 6⁄13 -
5. Statistics Mean
Calculate the mean of: 17, 17, 12, 22, 33, 29. Give your answer to 2 decimal places
Answer: 21.67