Keystones — Lintel
Five GCSE retrieval questions · 14 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 860,000 in standard form
Answer: 8.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 10.39cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 15:7. What fraction of the sweets are white?
Answer: 7⁄22 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 21, 22, 32, what is the missing number?
Answer: 41