Keystones — Lintel
Five GCSE retrieval questions · 26 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.086 in standard form
Answer: 8.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.62cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 2:7:4. What fraction of the sweets are white?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 25, 40, 22, what is the missing number?
Answer: 29