Keystones — Lintel
Five GCSE retrieval questions · 17 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 670,000,000 in standard form
Answer: 6.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 110
Answer: (x - 10)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.39cm -
4. Ratio Mixed ratio problems
£231.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £99.00 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 34, 37, 21, what is the missing number?
Answer: 56