Keystones — Lintel
Five GCSE retrieval questions · 17 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.071 in standard form
Answer: 7.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.28cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:6
Answer: 2:1:1 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 22, 28, 28, what is the missing number?
Answer: 58