### Home > CC2 > Chapter 3 > Lesson 3.3.3 > Problem 3-122

Copy the diagram and add two tiles so that the result is a value of

. You can add positive and/or negative tiles. Show the tiles you added to get this answer This problem is very similar to problem 3-34. Last time, you were told how many

pieces to add or subtract. This time, you will need to use your own understanding

to determine how best to reachby adding two pieces. Since the current value of this diagram is

, you will need to add one negative piece

and one positive piece to keep the value of. Copy the diagram again, but this time remove four tiles (again positives and/or negatives) so that the result is a value of

. Show the tiles you removed to get this answer. You already know the current value is

. By only removing pieces from the picture,

how doesbecome ? Think about this question, then proceed with the problem.

Use the following eTool to answer the questions.

Click the link at right for the full version of the eTool: *3-122 HW eTool* (CPM)