This activity goes along with the Harcourt math series (2005) Grade 2, Chapter 21, 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 35 pages, the first five are shown in the sample download file. This file includes describing patterns; pattern units; extending patterns; making patterns; transferring a pattern; and correcting a mistake in a pattern.