This is the sample of the 2nd grade 275 Page Addition book or the 2nd grade 275 page Subtraction book. The excerpts contain samples of the 180 reproducible, ten problem worksheets with answer keys in each book. The instruction method of delivery is included here along with the time frame for the year. This set of drill and practice sheets is designed to be a focusing activity or a closing activity. It has been used in my classroom as a center activity as well. I taught middle school math for years and found that these skills were weak when the students reached my class. I had the opportunity to teach second graders and found that they only lacked the practice to be fluent in the basic operations. This can be used as advanced 1st grade up to remediation in third grade as a resource.