Keystones — Lintel
Five GCSE retrieval questions · 13 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 610,000,000 in standard form
Answer: 6.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.62cm -
4. Ratio Mixed ratio problems
Divide 116 in the ratio 1:2:1
Answer: 29, 58 and 29 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 33, 45, 18, 39, what is the missing number?
Answer: 35