Keystones — Lintel
Five GCSE retrieval questions · 12 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.046 in standard form
Answer: 4.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.37cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 2:4. What fraction of the marbles are white?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 22, 17, 29, 22, 50, what is the missing number?
Answer: 58