Keystones — Lintel
Five GCSE retrieval questions · 2 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000056 in standard form
Answer: 5.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 19.68cm -
4. Ratio Mixed ratio problems
In ratio 11:8:5, what fraction is the second part?
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 40, 21, 17, 19, 7, 24, 41. Give your answer to 2 decimal places
Answer: 24.14