Keystones — Lintel
Five GCSE retrieval questions · 8 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 93,000,000 in standard form
Answer: 9.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.93cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 12:4. What fraction of the counters are blue?
Answer: 1⁄4 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 18, 18, 28, 29, 23, what is the missing number?
Answer: 34