Keystones — Lintel
Five GCSE retrieval questions · 27 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.065 in standard form
Answer: 6.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.28cm -
4. Ratio Mixed ratio problems
In ratio 4:10:1, what fraction is the second part?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 36, 19, 38, 17, 16, what is the missing number?
Answer: 54