Keystones — Lintel
Five GCSE retrieval questions · 19 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 61,000 in standard form
Answer: 6.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 36.81cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 7:11:3. What fraction of the marbles are white?
Answer: 11⁄21 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 16, 41, 40, what is the missing number?
Answer: 7