Keystones — Lintel
Five GCSE retrieval questions · 27 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 39,000,000 in standard form
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 19.62cm -
4. Ratio Mixed ratio problems
£162.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £108.00 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 20, 31, 35, 27, what is the missing number?
Answer: 37