Subtracting Integers

Drag the appropiate number of tiles to each side of the - sign to model the question. When your model matches the question, move all of the tiles to the left of the - sign. Notice what happens to the tiles as they move across the - sign. If you have yellow and red tiles, try placing a red tile on top of the yellow tile to show a zero pair. Repeat with all of the zero pairs to see the integer sum modelled by each set of tiles.

 
 
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Started September, 1998. Copyright 1999, 2000, 2001, 2002

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