Your students will enjoy and benefit from this introduction to the concept of the using the traditional algorithm for adding and subtracting double-digit numbers, without regrouping. To see a quick video preview of this slideshow, visit this link on YouTube: http://youtu.be/1248jbh3b18 {{{Just copy and paste the link or download the preview file for a direct link.}}} This animated learning tool can be viewed on a projection screen, interactive whiteboard or Smart Board, or on a computer sc