Keystones — Lintel
Five GCSE retrieval questions · 13 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 950,000,000 in standard form
Answer: 9.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.35cm -
4. Ratio Mixed ratio problems
In ratio 12:11:4, what fraction is the first part?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 39, 33, 22, 42, what is the missing number?
Answer: 9