Keystones — Lintel
Five GCSE retrieval questions · 12 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 61,000,000 in standard form
Answer: 6.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.64cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 8:2:4. What fraction of the counters are green?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 16, 18, 18, 48, 28, what is the missing number?
Answer: 34