Keystones — Lintel
Five GCSE retrieval questions · 1 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00009 in standard form
Answer: 9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 22.52cm -
4. Ratio Mixed ratio problems
£145.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £58.00 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 15, 19, 17, 28, what is the missing number?
Answer: 31