My math teaching blog: http://zerosumruler.wordpress.com/ For powerpoint presentations of my lectures, go to the "files" tab at http://www.schoolrack.com/donohue/ This video shows an easy way to add negative numbers to positive ones. Instead of using the rigid number line, use absolute value. Absolute value is your friend. Twitter me @ZeroSumRuler Facebook me: "ZeroSum Ruler"
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