Keystones — Lintel
Five GCSE retrieval questions · 4 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 90,000,000 in standard form
Answer: 9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 96
Answer: (x + 12)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 13.3cm -
4. Ratio Mixed ratio problems
In ratio 9:1:1, what fraction is the first part?
Answer: 9⁄11 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 23, 30, 42, 21, 40, what is the missing number?
Answer: 54