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3-19.

Show the numbers of and tiles represented by each expression below. Sketch each model and state the number that it represents.  

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    If you need help starting the problem, look at the Math Notes box in Lesson 2.2.4.

    Begin by sketching a model of the integers.

    Use the model you just sketched to help you determine what number the expression represents.

    This expression represents .

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    Use part (a) as a guide for this problem. Remember to look for and eliminate zeros.

    This expression represents . Remember to draw a diagram to model this expression.

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    Use part (a) as a guide for solving this problem.