### Home > MC1 > Chapter 3 > Lesson 3.3.3 > Problem 3-86

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Refer to the diagram at right to answer the questions below. 3-86 HW eTool (CPM). Homework Help ✎ Copy the diagram and add two pieces so that the result is a value of −2. You can add positive and/or negative pieces. Show the pieces you added to get this answer.

Copy the diagram again, but this time remove four pieces (again positives and/or negatives) so that the result is a value of 2. Show the pieces you removed to get this answer.

This problem is very similar to problem 3-66. Last time, you were told how many pieces

to add or subtract. This time, you will need to use the skills you have attained to determine

how best to reach −2 by adding two pieces.

Since the current value of this diagram is −2, you will need to add one negative piece

and one positive piece to keep the value of −2.

You already know the current value is −2. By only removing pieces from the picture,

how does −2 become 2? Think about this question, then proceed with the problem.

Use the etool below for help.

Click the link at right for the full version of the eTool: MC1 3-86 HW eTool