Keystones — Lintel
Five GCSE retrieval questions · 25 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0099 in standard form
Answer: 9.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 48.01cm -
4. Ratio Mixed ratio problems
£222.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £74.00 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 27, 44, 25, 42, 16, what is the missing number?
Answer: 44