I explain three different models you can use to show why subtraction of integers works: 1) number line jumps; 2) the concept of difference; 3) positive/negative counters. The bottom line is that students need to learn the shortcuts and rules, but these models can help justify the rules.
Learn more about integers with my book at http://www.mathmammoth.com/integers.php -- it is available both as a download and as a printed book. The download can be filled in on a computer/tablet device.
Tagged under: subtraction,integers,negative numbers,number line,Integer,Negative Number
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