Keystones — Lintel
Five GCSE retrieval questions · 22 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00006 in standard form
Answer: 6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 24.32cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 5:9. What fraction of the marbles are blue?
Answer: 9⁄14 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 35, 30, 32, 27, what is the missing number?
Answer: 16