Keystones — Lintel
Five GCSE retrieval questions · 21 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00008 in standard form
Answer: 8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 36.81cm -
4. Ratio Mixed ratio problems
In ratio 4:6:6, what fraction is the first part?
Answer: 1⁄4 -
5. Statistics Mean
Calculate the mean of: 20, 22, 15, 12, 37, 19. Give your answer to 2 decimal places
Answer: 20.83