Keystones — Lintel
Five GCSE retrieval questions · 17 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00025 in standard form
Answer: 2.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.73cm -
4. Ratio Mixed ratio problems
In ratio 1:8:5, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 41, 18, 18, 27, what is the missing number?
Answer: 26