Keystones — Lintel
Five GCSE retrieval questions · 31 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 46,000 in standard form
Answer: 4.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.74cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 7:9:8. What fraction of the counters are green?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 50, 16, 40, 32, what is the missing number?
Answer: 52