Keystones — Lintel
Five GCSE retrieval questions · 30 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,200,000 in standard form
Answer: 5.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 120
Answer: (x + 12)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 8.77cm -
4. Ratio Mixed ratio problems
£231.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £165.00 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 31, 40, 38, 15, 19, what is the missing number?
Answer: 19