Keystones — Lintel
Five GCSE retrieval questions · 20 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000049 in standard form
Answer: 4.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 60
Answer: (x + 5)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.49cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 10:5. What fraction of the counters are red?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 34, 31, 22, 48, what is the missing number?
Answer: 25