Keystones — Lintel
Five GCSE retrieval questions · 24 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 81,000 in standard form
Answer: 8.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 29.19cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 6:4:4. What fraction of the counters are blue?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 48, 34, 31, what is the missing number?
Answer: 7