This link has been bookmarked by 42 people . It was first bookmarked on 09 Jul 2007, by btcactus.
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Charlyn TrussellGr. K up.Virtual Unifix cubes sit on scale waiting to be balanced. Students pick from the possible answers to add the correct amount to the unbalanced tray. They can work on seeing what addend pairs equal the same sums.
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Joann Groarkmath interactive balance
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