Keystones — Lintel
Five GCSE retrieval questions · 5 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 710,000 in standard form
Answer: 7.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x + 3
Answer: (x + 3)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 34.cm -
4. Ratio Mixed ratio problems
In ratio 9:11:5, what fraction is the first part?
Answer: 9⁄25 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 20, 44, 27, 29, what is the missing number?
Answer: 40