Keystones — Lintel
Five GCSE retrieval questions · 17 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 69,000 in standard form
Answer: 6.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 18.63cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 85p
Answer: 20:17 -
5. Statistics Mean
Calculate the mean of: 28, 17, 16, 34, 26, 26, 9. Give your answer to 2 decimal places
Answer: 22.29