Posted by **glenn** on Tuesday, October 26, 2010 at 10:51pm.

What models can be used to help explain the concepts of addition and subtraction of rational numbers? What are the benefits to using such a model? What limitations does the model have? Create an addition or subtraction problem and demonstrate how the model might work. Participate in the discussion by identifying other models that might work in solving the problems posed by your classmates. Discuss the benefits and restrictions associated with the model.

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