Keystones — Lintel
Five GCSE retrieval questions · 28 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 97,000,000 in standard form
Answer: 9.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 27
Answer: (x + 9)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 9.61cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 2:4. What fraction of the marbles are orange?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 46, 24, 34, what is the missing number?
Answer: 32