Keystones — Lintel
Five GCSE retrieval questions · 9 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00055 in standard form
Answer: 5.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 18
Answer: (x + 9)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.49cm -
4. Ratio Mixed ratio problems
In ratio 9:4:5, what fraction is the second part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 41, 19, 21, 18, what is the missing number?
Answer: 36