I thought of this great interactive website when reading the article. It shows a pan balance and students increase or decrease the number on one side to = the other side.
You also have many options like comparing numbers and number models. I use it frequently on a Smartboard, but it could be used for small group instruction or as a center as well. I use it after using manipulatives.
http://www.wmnet.org.uk/wmnet/custom/files_uploaded/uploaded_resources/850/calcbalance.3swf
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