Keystones — Lintel
Five GCSE retrieval questions · 30 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 270,000 in standard form
Answer: 2.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.52cm -
4. Ratio Mixed ratio problems
Simplify: 18:9:9
Answer: 2:1:1 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 44, 47, 20, 33, what is the missing number?
Answer: 16