Keystones — Lintel
Five GCSE retrieval questions · 22 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00026 in standard form
Answer: 2.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 10
Answer: (x + 10)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 8.09cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 11:15. What fraction of the marbles are red?
Answer: 11⁄26 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 50, 28, 32, 39, what is the missing number?
Answer: 16