This set of PowerPoint presentations introduces the concept of Comparative Relational Thinking using subtraction expressions modeled on number lines. Through the use of animated slides, students are acquainted with Comparative Relational Thinking and walked through the process of using it to determine if two subtraction expressions are equal. There are two versions of the presentation included in this pack, each utilizing a different method for modeling subtraction. Teacher preference will determine which presentation to use with the class.
After an introductory example, the presentations include a second worked example, an example with two expressions that are not equal, and two student practice problems to check for understanding.
To assist you as you present the content, there are also Teacher Notes documents. These notes include screenshots of each iteration of the slides along with a teacher script and the desired student responses to all questions. These notes outline every single click throughout the presentations, with notes corresponding to each click organized into separate rows.
These presentations can be used to teach Fourth Grade Mathematics Florida Standard MAFS.4.OA.1.a: Determine whether an equation is true or false by using comparative relational thinking. For example, without adding 60 and 24, determine whether the equation 60 + 24 = 57 + 27 is true or false.
Created by Amber Mealey.