Keystones — Lintel
Five GCSE retrieval questions · 25 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000021 in standard form
Answer: 2.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.4cm -
4. Ratio Mixed ratio problems
Divide 133 in the ratio 2:2:3
Answer: 38, 38 and 57 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 48, 34, 41, 30, 20, what is the missing number?
Answer: 49