Keystones — Lintel
Five GCSE retrieval questions · 17 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 610,000 in standard form
Answer: 6.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.33cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 8:12. What fraction of the counters are white?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 19, 17, 45, what is the missing number?
Answer: 55