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11-3: Subtracting Integers The University of Texas at Dallas

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2 ways to help you subtract integers. 1. Use Color Counters 2. Mentally

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SUBTRACTING INTEGERS (using color counters) We often think of subtraction as a take away operation. Which diagram could be used to compute = ? = ? The University of Texas at Dallas

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SUBTRACTING INTEGERS (using color counters) The University of Texas at Dallas We cant take away 5 yellow tiles from this diagram. There is not enough tiles to take away!! This diagram shows adding 2 zero pairs. Now we can take 5 yellow tiles away, we have 2 red tiles left.

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SUBTRACTING INTEGERS (using color counters) Use your red and yellow tiles to model each subtraction problem. The University of Texas at Dallas = ? = ? ANSWER

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SUBTRACTING INTEGERS The University of Texas at Dallas This representation of - 2 doesnt have enough tiles to take away - 4. If you add 2 zero pairs(adding zero) you would have a total of 4 red tiles and the tiles still represent - 2. Now you can take away 4 red tiles = yellow tiles are left, so the answer is…

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SUBTRACTING INTEGERS (using color counters) The University of Texas at Dallas Work this problem. Work this problem = ? ANSWER

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SUBTRACTING INTEGERS The University of Texas at Dallas Add enough zero pairs so you can take away 5 red tiles. Take away 5 red tiles, you have 8 yellow tiles left = + 8

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SUBTRACTING INTEGERS (using color counters) The University of Texas at Dallas Work this problem. Work this problem = ? ANSWER

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SUBTRACTING INTEGERS The University of Texas at Dallas Add two zero pairs so you can take away 2 yellow tiles. Take away 2 yellow tiles, you have 5 red tiles left = - 5

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Subtracting Integers Mentally, then check using color counters. When you subtract integers you…….. ADD the OPPOSITE !!!! 1.9 – (-2) 2.+3 – (-1) 3.-5 – (-8)

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Practice Time Practice Time P 585 # 1-7

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