Keystones — Lintel
Five GCSE retrieval questions · 11 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 650,000 in standard form
Answer: 6.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 11
Answer: (x - 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.44cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 12:9. What fraction of the counters are red?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 40, 15, 33, what is the missing number?
Answer: 36