Keystones — Lintel
Five GCSE retrieval questions · 11 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,800,000 in standard form
Answer: 6.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.48cm -
4. Ratio Mixed ratio problems
In ratio 1:12:8, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 46, 33, 35, what is the missing number?
Answer: 42