Keystones — Lintel
Five GCSE retrieval questions · 6 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.014 in standard form
Answer: 1.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 21.23cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 11:7. What fraction of the counters are black?
Answer: 11⁄18 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 50, 31, 31, what is the missing number?
Answer: 20