Keystones — Lintel
Five GCSE retrieval questions · 7 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000069 in standard form
Answer: 6.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.09cm -
4. Ratio Mixed ratio problems
In ratio 5:1:7, what fraction is the second part?
Answer: 1⁄13 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 18, 21, 45, 18, what is the missing number?
Answer: 68