Keystones — Lintel
Five GCSE retrieval questions · 4 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,100,000 in standard form
Answer: 5.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 45°. Find opposite
Answer: 25cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 1:3:4
Answer: 10, 30 and 40 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 26, 50, 34, 25, what is the missing number?
Answer: 20