Keystones — Lintel
Five GCSE retrieval questions · 24 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 14,000 in standard form
Answer: 1.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 96
Answer: (x + 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 27.01cm -
4. Ratio Mixed ratio problems
In ratio 10:11:12, what fraction is the first part?
Answer: 10⁄33 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 34, 47, 36, 44, what is the missing number?
Answer: 9