Keystones — Lintel
Five GCSE retrieval questions · 23 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,300,000 in standard form
Answer: 4.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 22.66cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 10:2. What fraction of the marbles are red?
Answer: 5⁄6 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 28, 23, 36, what is the missing number?
Answer: 69