Keystones — Lintel
Five GCSE retrieval questions · 16 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,500,000 in standard form
Answer: 2.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.85cm -
4. Ratio Mixed ratio problems
In ratio 6:4:4, what fraction is the first part?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 49, 35, 46, 47, 27, what is the missing number?
Answer: 18