Keystones — Lintel
Five GCSE retrieval questions · 28 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00079 in standard form
Answer: 7.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x + 2
Answer: (x + 2)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.86cm -
4. Ratio Mixed ratio problems
In ratio 12:2:8, what fraction is the first part?
Answer: 6⁄11 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 50, 20, 15, what is the missing number?
Answer: 11