Ignacio and Oliver are trying to decide if there are other ways to change expressions on the Expression Comparison Mat without affecting which side is greater. They have invented some new strategies and described them below. Your Task: For each of the moves below:

Build the Expression Comparison Mats on your paper.

Follow each set of directions for the mat shown in each strategy below.

Determine if the move in the strategy is valid for maintaining the relationship between the two expressions. Be prepared to justify your response.