Keystones — Lintel
Five GCSE retrieval questions · 24 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 650,000 in standard form
Answer: 6.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.05cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 12:13. What fraction of the marbles are white?
Answer: 13⁄25 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 35, 42, 17, what is the missing number?
Answer: 62