Keystones — Lintel
Five GCSE retrieval questions · 19 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 18,000,000 in standard form
Answer: 1.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 30
Answer: (x + 6)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 13.58cm -
4. Ratio Mixed ratio problems
In ratio 9:2:2, what fraction is the first part?
Answer: 9⁄13 -
5. Statistics Mean
Calculate the mean of: 15, 8, 15, 43, 23, 5, 11, 45. Give your answer to 2 decimal places
Answer: 20.63