Balancing Animals - 5 views
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Darcy Goshorn on 17 Dec 09Use animals as 'non-standard' units to weigh others. 'We're going to weigh the duck! What shall we use to weigh with?' 'How many hedgehogs do you think we will need to balance the scales? Count with me.' 'I've put on 2, how many more do you think are needed? Come and count on some more to see if we are right.' 'Whoops, I've put too many on. How many shall I take off?'