Keystones — Lintel
Five GCSE retrieval questions · 31 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.86cm -
4. Ratio Mixed ratio problems
In ratio 4:4:11, what fraction is the third part?
Answer: 11⁄19 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 23, 37, 26, 47, what is the missing number?
Answer: 32