Keystones — Lintel
Five GCSE retrieval questions · 7 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 870,000 in standard form
Answer: 8.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 108
Answer: (x + 12)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.44cm -
4. Ratio Mixed ratio problems
£396.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £176.00 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 50, 31, 20, what is the missing number?
Answer: 27