Keystones — Lintel
Five GCSE retrieval questions · 9 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000027 in standard form
Answer: 2.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 36
Answer: (x + 9)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.71cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 7:6:8. What fraction of the counters are red?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 41, 36, 27, what is the missing number?
Answer: 28