Keystones — Lintel
Five GCSE retrieval questions · 24 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 57,000,000 in standard form
Answer: 5.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 96
Answer: (x - 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.71cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 2:2:3. What fraction of the marbles are purple?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 22, 36, 45, 22, what is the missing number?
Answer: 5