Keystones — Lintel
Five GCSE retrieval questions · 31 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 91,000,000 in standard form
Answer: 9.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 15cm -
4. Ratio Mixed ratio problems
£168.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £105.00 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 37, 15, 17, what is the missing number?
Answer: 19