This activity goes along with the Harcourt math series (2005) Grade 2, Chapter 11, 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 45 pages and one focuses on a review of addition and subtraction with regrouping. It covers different ways to add (counting on by ones, tens and regrouping), 2 digit addition practice, column addition, different ways to subtract (count back by ones, tens, and regrouping), 2 digit subtraction practice, mixed addition and subtraction practice (2 digit), problem solving strategy-work backwards.