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I've been searching for some good examples of bar models to illustrate Carolyn's SummerMathChallenge post, and I just came across this page from the Primary Mathematics Grade 2A workbook. Mind you, '2A' is the workbook for the first half of 2nd grade. Second semester is '2B'. update 7-5-06: The original image has disappeared, so I'm replacing it with this "worked problem" from Challenging Word Problems Primary 2:
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