Keystones — Lintel
Five GCSE retrieval questions · 9 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,800,000 in standard form
Answer: 3.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 17.92cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 85cm
Answer: 80:17 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 25, 23, 30, what is the missing number?
Answer: 30