Keystones — Lintel
Five GCSE retrieval questions · 5 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 140,000 in standard form
Answer: 1.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x + 1
Answer: (x - 1)(x - 1) -
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 1:9:3, what fraction is the first part?
Answer: 1⁄13 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 49, 49, 15, 28, 49, what is the missing number?
Answer: 14