I used this Flash interactive the other day in a presentation to get things started. It’s a fun puzzle that your students can work on together at a Smartboard. Level One, the only one I can get past, can be done in no fewer than six steps. Quick usability tip – drag the container to the tap to fill; to another container to transfer and to the toilet to empty.
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The URL: http://www.subtangent.com/maths/flash/jugs.swf