Keystones — Lintel
Five GCSE retrieval questions · 21 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00061 in standard form
Answer: 6.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.95cm -
4. Ratio Mixed ratio problems
£306.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £136.00 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 27, 47, 17, what is the missing number?
Answer: 45