Keystones — Lintel
Five GCSE retrieval questions · 23 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 26,000 in standard form
Answer: 2.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 18
Answer: (x + 9)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 17.38cm -
4. Ratio Mixed ratio problems
In ratio 4:11:6, what fraction is the first part?
Answer: 4⁄21 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 18, 28, 20, 30, 29, what is the missing number?
Answer: 49