Keystones — Lintel
Five GCSE retrieval questions · 18 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 310,000 in standard form
Answer: 3.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x + 9
Answer: (x + 3)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.86cm -
4. Ratio Mixed ratio problems
£160.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £60.00 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 23, 32, 42, 40, 50, what is the missing number?
Answer: 47