Keystones — Lintel
Five GCSE retrieval questions · 3 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 190,000 in standard form
Answer: 1.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.09cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 6:5. What fraction of the counters are blue?
Answer: 5⁄11 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 42, 16, 21, what is the missing number?
Answer: 41