Keystones — Lintel
Five GCSE retrieval questions · 28 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 600,000,000 in standard form
Answer: 6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 17x + 66
Answer: (x + 11)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.57cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 10:5. What fraction of the counters are black?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 49, 50, 23, 31, 36, what is the missing number?
Answer: 27