Keystones — Lintel
Five GCSE retrieval questions · 29 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 80,000 in standard form
Answer: 8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.23cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 2:1:4
Answer: 20, 10 and 40 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 29, 50, 24, 28, 34, what is the missing number?
Answer: 63