Keystones — Lintel
Five GCSE retrieval questions · 3 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000013 in standard form
Answer: 1.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 8
Answer: (x - 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 16.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m : 55cm
Answer: 120:11 -
5. Statistics Mean
Calculate the mean of: 28, 27, 47, 28, 29, 49, 19, 8. Give your answer to 2 decimal places
Answer: 29.38