Keystones — Lintel
Five GCSE retrieval questions · 11 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 540,000,000 in standard form
Answer: 5.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 17.88cm -
4. Ratio Mixed ratio problems
In ratio 5:4:4, what fraction is the second part?
Answer: 4⁄13 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 21, 50, 22, 22, 36, what is the missing number?
Answer: 53