Keystones — Lintel
Five GCSE retrieval questions · 26 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 860,000 in standard form
Answer: 8.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 45°. Find opposite
Answer: 30cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 300 ml
Answer: 10:1 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 24, 32, 46, 20, 27, what is the missing number?
Answer: 55