Keystones — Lintel
Five GCSE retrieval questions · 18 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 530,000 in standard form
Answer: 5.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.13cm -
4. Ratio Mixed ratio problems
In ratio 4:10:5, what fraction is the second part?
Answer: 10⁄19 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 39, 18, 19, 29, what is the missing number?
Answer: 65