Keystones — Lintel
Five GCSE retrieval questions · 6 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0035 in standard form
Answer: 3.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 19.99cm -
4. Ratio Mixed ratio problems
In ratio 4:10:3, what fraction is the third part?
Answer: 3⁄17 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 44, 16, 47, 43, what is the missing number?
Answer: 25