Keystones — Lintel
Five GCSE retrieval questions · 14 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,000,000 in standard form
Answer: 7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 10.79cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 8:10. What fraction of the counters are red?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 43, 37, 44, 25, what is the missing number?
Answer: 21