Keystones — Lintel
Five GCSE retrieval questions · 24 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,700,000 in standard form
Answer: 6.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.29cm -
4. Ratio Mixed ratio problems
In ratio 5:11:2, what fraction is the first part?
Answer: 5⁄18 -
5. Statistics Mean
Calculate the mean of: 10, 20, 30, 11, 39, 29, 34. Give your answer to 2 decimal places
Answer: 24.71