Keystones — Lintel
Five GCSE retrieval questions · 4 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0037 in standard form
Answer: 3.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 13.58cm -
4. Ratio Mixed ratio problems
£240.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £150.00 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 30, 20, 50, 22, what is the missing number?
Answer: 23