Keystones — Lintel
Five GCSE retrieval questions · 30 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00029 in standard form
Answer: 2.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.43cm -
4. Ratio Mixed ratio problems
In ratio 8:12:5, what fraction is the first part?
Answer: 8⁄25 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 21, 26, 24, 30, what is the missing number?
Answer: 29