Keystones — Lintel
Five GCSE retrieval questions · 9 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 39,000,000 in standard form
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.37cm -
4. Ratio Mixed ratio problems
Divide 190 in the ratio 2:2:1
Answer: 76, 76 and 38 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 30, 36, 17, what is the missing number?
Answer: 5