Keystones — Lintel
Five GCSE retrieval questions · 18 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.067 in standard form
Answer: 6.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 10
Answer: (x + 5)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.38cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 3:6:2. What fraction of the marbles are green?
Answer: 2⁄11 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 20, 41, 34, what is the missing number?
Answer: 41