Keystones — Lintel
Five GCSE retrieval questions · 1 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 63,000 in standard form
Answer: 6.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.21cm -
4. Ratio Mixed ratio problems
Black, white and yellow marbles are in the ratio 9:4:8. What fraction of the marbles are white?
Answer: 4⁄21 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 16, 50, 44, 28, 15, what is the missing number?
Answer: 21