Keystones — Lintel
Five GCSE retrieval questions · 18 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,100,000 in standard form
Answer: 3.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 35
Answer: (x + 7)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 20.14cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 11:6:3. What fraction of the marbles are white?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 25, 35, 33, 22, what is the missing number?
Answer: 70