We have been learning about many strategies that can help us solve subtraction problems. Using a number line is one strategy that students can use to solve subtraction problems. This video is to help reinforce the concept and clear up any confusion that remains.
http://www.teachertube.com/video/subtraction-using-a-number-line-403629
http://www.teachertube.com/video/subtraction-using-a-number-line-403629