This is a Smartboard activity that allows students to practice working with adding decimals. The problems in this file have start out basic with two addends and gradually get more challenging and end with three addends and have a different number of digits before and after the decimals in the problems. The answers are included on each page for immediate student feedback. The preview file has thumbnail shots of many of the pages from this file. This can be used in whole group, small group, or as a math center.