Keystones — Lintel
Five GCSE retrieval questions · 3 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 52,000 in standard form
Answer: 5.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.26cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 14:12. What fraction of the counters are red?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 18, 37, 22, 45, 16, what is the missing number?
Answer: 66