Stage: 3 Challenge Level: 
Start with weights that differ by 2kg. What whole number averages can you make?
Then try weights that differ by 3kg, then by 4kg...
Visualising. Mathematical reasoning & proof. Creating expressions/formulae. Mean. Averages. Interactivities. Working systematically. Making and testing hypotheses. Generalising. smartphone.
Published November 2008,December 2008.
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