Keystones — Lintel
Five GCSE retrieval questions · 2 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 14,000,000 in standard form
Answer: 1.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 9
Answer: (x + 9)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.77cm -
4. Ratio Mixed ratio problems
In ratio 5:12:4, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 27, 28, 18, 31, what is the missing number?
Answer: 6