This inclusive curriculum provides a one-stop math shop for addition of three digit numbers! The skills of carrying ones and tens are practiced in this lesson. Geared for grades 4 through 8, this product includes a pretest and a post-test for diagnosis, two levels of practice worksheets, and an activity worksheet. This product can be used in whole or in part to provide extra practice, to reinforce skills, to give a change of pace, or as an enrichment activity for the entire class, small groups or individuals.