Keystones — Lintel
Five GCSE retrieval questions · 24 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000059 in standard form
Answer: 5.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 32.17cm -
4. Ratio Mixed ratio problems
In ratio 6:8:9, what fraction is the third part?
Answer: 9⁄23 -
5. Statistics Mean
Calculate the mean of: 14, 50, 23, 6, 28, 42, 33, 25. Give your answer to 2 decimal places
Answer: 27.63