Third Grade Math Expressions Unit 3. Planning made easy! Everything you will need for Unit 3 in one easy to use smart notebook file. Once I created these I no longer had to write detailed math lesson plans. I can just refer to slide numbers! Each of the pages of the student activity book have been downloaded from the Think Central Website and inserted into smart notebook so you can project the page as students are working. For each page I have created boxes to cover the answers so you can move them and check as you go. For each lesson I have included a slide with the essential questions for the lesson, vocabulary, and the quick practice activities from the teachers manual. I also included many slides that I have created that include the math talk questions and some practice slides or mini lessons I use with my students.