Keystones — Lintel
Five GCSE retrieval questions · 3 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.013 in standard form
Answer: 1.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 99
Answer: (x + 9)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 19.91cm -
4. Ratio Mixed ratio problems
In ratio 9:11:1, what fraction is the first part?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 15, 48, 38, what is the missing number?
Answer: 19