Keystones — Lintel
Five GCSE retrieval questions · 2 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00037 in standard form
Answer: 3.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 15.14cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 6:2:12. What fraction of the marbles are blue?
Answer: 1⁄10 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 39, 23, 33, 47, 35, what is the missing number?
Answer: 21