Keystones — Lintel
Five GCSE retrieval questions · 2 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,400,000 in standard form
Answer: 4.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 84
Answer: (x + 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.33cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 11:7:5. What fraction of the sweets are blue?
Answer: 7⁄23 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 25, 19, 46, what is the missing number?
Answer: 18