Keystones — Lintel
Five GCSE retrieval questions · 27 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.086 in standard form
Answer: 8.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 60
Answer: (x + 12)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 31.42cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 12:10. What fraction of the marbles are black?
Answer: 6⁄11 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 22, 19, 48, what is the missing number?
Answer: 7