Keystones — Lintel
Five GCSE retrieval questions · 26 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 35,000 in standard form
Answer: 3.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.22cm -
4. Ratio Mixed ratio problems
In ratio 9:8:7, what fraction is the second part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 16, 28, 39, 46, what is the missing number?
Answer: 51