Keystones — Lintel
Five GCSE retrieval questions · 28 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 27
Answer: (x - 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 21.86cm -
4. Ratio Mixed ratio problems
£360.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £225.00 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 37, 37, 49, what is the missing number?
Answer: 21