This video teaches how to subtract integers using different methods such as adding the opposite and the two-pencil stroke method. The concept of the opposite of a number is explained and visual models using counters are shown to help understand the reason why these methods work. Examples are given to illustrate the steps involved in subtracting and the transcript also explains why subtracting is the same as adding the opposite of a number.
Shows how to subtract postive and negative numbers; uses counters. Explains adding the opposite and two stroke method.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com