Keystones — Lintel
Five GCSE retrieval questions · 15 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000048 in standard form
Answer: 4.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 20
Answer: (x + 10)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 21.61cm -
4. Ratio Mixed ratio problems
In ratio 8:6:10, what fraction is the first part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 16, 48, 17, 21, what is the missing number?
Answer: 23