Keystones — Lintel
Five GCSE retrieval questions · 26 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.028 in standard form
Answer: 2.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 24
Answer: (x + 12)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 19.31cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 14:9. What fraction of the marbles are blue?
Answer: 9⁄23 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 45, 15, 19, what is the missing number?
Answer: 69