Keystones — Lintel
Five GCSE retrieval questions · 31 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,100,000 in standard form
Answer: 1.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 99
Answer: (x - 9)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.97cm -
4. Ratio Mixed ratio problems
£400.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £250.00 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 41, 46, 50, 38, what is the missing number?
Answer: 10