Keystones — Lintel
Five GCSE retrieval questions · 9 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,100,000 in standard form
Answer: 4.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.18cm -
4. Ratio Mixed ratio problems
In ratio 1:11:9, what fraction is the first part?
Answer: 1⁄21 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 17, 44, 30, 31, 43, what is the missing number?
Answer: 21