Here are other examples of how I used the interactive notebooks to engage with textbook material. The pictures above are from my middle school books but I have used both in the elementary school setting as well.
The first picture is a simple question strip. I asked a series of questions that the students had to find the answers to in their textbook. To differentiate instruction I put the page number where the students could find the information next to the question. In the elementary school I kept the first couple of sentence strips "easy" - meaning the answers could be found very easily and there were only about five questions. You can build up after students become familiar with the formatting of the strips and how you expect them to answer. Definitely model this! Students will try and write the answers under the question and not to the side as above.
The second one was a Who, What, Why, Where and When strip that I used with the terms migration, hibernation, and courtship. Students had to read the sections in the textbook and tell me who migrates, what is migration, why do animals migrate, where do they migrate and when do they migrate (they then got to draw a picture of the concept).