Keystones — Lintel
Five GCSE retrieval questions · 22 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 310,000 in standard form
Answer: 3.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.81cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 11:12. What fraction of the marbles are orange?
Answer: 11⁄23 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 34, 38, 22, 42, what is the missing number?
Answer: 24