Keystones — Lintel
Five GCSE retrieval questions · 16 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,000,000 in standard form
Answer: 7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 22.02cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 10:12. What fraction of the marbles are black?
Answer: 5⁄11 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 19, 20, 15, what is the missing number?
Answer: 66