Keystones — Lintel
Five GCSE retrieval questions · 8 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 41,000 in standard form
Answer: 4.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.43cm -
4. Ratio Mixed ratio problems
In ratio 5:11:12, what fraction is the second part?
Answer: 11⁄28 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 19, 36, 42, 23, 40, what is the missing number?
Answer: 20