Keystones — Lintel
Five GCSE retrieval questions · 1 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 180,000 in standard form
Answer: 1.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 27.88cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 15:7. What fraction of the sweets are red?
Answer: 15⁄22 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 44, 19, 22, 42, what is the missing number?
Answer: 23