This activity goes along with the Harcourt math series (2005) Grade 2, Chapter 10, however, the material is just as good to cover the same skill in any series. The level of interactivity depends on the purpose of the activity. For example, in some activities the purpose is to be able to identify the amount rather than create it, so in that case the activity is not interactive. There are, however, many interactive activities. This file has 70 pages and focuses on subtraction with regrouping. It includes subtracting one digit numbers from two digit numbers, subtracting two 2 digit numbers, rewriting horizontal problems as vertical for easy solving, using addition to check subtraction and choosing a computational method to solve problems.