Keystones — Lintel
Five GCSE retrieval questions · 27 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,500,000 in standard form
Answer: 8.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 7
Answer: (x - 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 12.59cm -
4. Ratio Mixed ratio problems
In ratio 2:5:4, what fraction is the first part?
Answer: 2⁄11 -
5. Statistics Mean
Calculate the mean of: 18, 21, 40, 38, 48, 28, 16, 34. Give your answer to 2 decimal places
Answer: 30.38