Keystones — Lintel
Five GCSE retrieval questions · 28 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 18
Answer: (x - 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 16.52cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 2:10:6. What fraction of the marbles are red?
Answer: 1⁄9 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 28, 29, 22, what is the missing number?
Answer: 17