Keystones — Lintel
Five GCSE retrieval questions · 30 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0081 in standard form
Answer: 8.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.78cm -
4. Ratio Mixed ratio problems
£232.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £87.00 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 32, 30, 40, 48, 17, what is the missing number?
Answer: 13