Keystones — Lintel
Five GCSE retrieval questions · 12 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.025 in standard form
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 40
Answer: (x + 10)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 22.64cm -
4. Ratio Mixed ratio problems
In ratio 6:10:11, what fraction is the first part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 50, 24, 34, 18, what is the missing number?
Answer: 54