Keystones — Lintel
Five GCSE retrieval questions · 16 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 38,000,000 in standard form
Answer: 3.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 88
Answer: (x - 8)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
In ratio 10:11:4, what fraction is the second part?
Answer: 11⁄25 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 37, 30, 34, what is the missing number?
Answer: 51