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2-42.

WShaded tile is plus 1.  Tile is negative 1.rite and simplify the algebraic expression shown in each Expression Mat below.      

A zero pair is a positive and negative of the same shape in the same box.

  1. A 2 region Expression Mat. The positive region has 2 positive, x tiles, and 3 negative unit tiles. The negative region has 1 positive, x-tile ,and 1 positive unit tile.

Use the expression mat in the eTool below to simplify the algebraic expression.
Click the link at right for the full version of the eTool: 2-42a HW eTool 

Flip all shapes in the bottom box to the top. If they are positive make them negative. If they are negative make them positive.

Make any zero pairs you can.

Simplify

  1. A 2 region Expression Mat. The positive region has 1 positive, y tile, one negative, y-tile, 3 positive unit tiles, and 1 negative unit tile. The negative region has no tiles.

Use the expression mat in the eTool below to simplify the algebraic expression.
Click the link at right for the full version of the eTool: 2-42b HW eTool

Follow the steps in part (a).

2

  1. A 2 region Expression Mat. The positive region has one negative, x-tile. The negative region has one positive, x-tile and 2 positive unit tiles.

Use the expression mat in the eTool below to simplify the algebraic expression.
Click the link at right for the full version of the eTool: 2-42c HW eTool 

Follow the steps in part (a).