Keystones — Lintel
Five GCSE retrieval questions · 13 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00095 in standard form
Answer: 9.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 96
Answer: (x + 12)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.86cm -
4. Ratio Mixed ratio problems
In ratio 1:10:10, what fraction is the second part?
Answer: 10⁄21 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 40, 45, 16, what is the missing number?
Answer: 19