Keystones — Lintel
Five GCSE retrieval questions · 22 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0082 in standard form
Answer: 8.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 120
Answer: (x + 12)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.78cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 7:6:9. What fraction of the counters are yellow?
Answer: 9⁄22 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 30, 38, 41, 19, what is the missing number?
Answer: 22