Keystones — Lintel
Five GCSE retrieval questions · 25 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000077 in standard form
Answer: 7.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.61cm -
4. Ratio Mixed ratio problems
£120.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £40.00 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 32, 31, 21, 38, what is the missing number?
Answer: 68