This activity goes along with the Harcourt math series (2005) Grade 2, Chapter 28, 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 particular file has 85 pages, five pages are shown in the sample download file. This file includes comparing three digit numbers; identifying missing three digit numbers; ordering numbers on a number line; identifying unknown numbers on a number line; skip counting with three digit numbers using hundred charts, calculators, mental math and coins; problem solving by finding a strategy.