Stage: 1 Challenge Level: 
Two children are playing with three balls, one blue, one red and one green.
They toss up the balls, which run down a slope so that they land in a row of three.
How many different ways could the balls land?
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Compound transformations. Working systematically. Data collection. Games. Combinations. Visualising. Addition & subtraction. Investigations. Interactivities. Practical Activity.
Published November 2005,December 2005.
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