Addition and subtraction within 10 - Find the difference 2 - Presentation

Lesson 22, titled "Finding the Difference (2)," is designed to help students understand how to find the difference between two quantities using bar models. The lesson begins with a discussion on what a bar model could look like and how it can be used to represent and solve problems in addition and subtraction. Students are then introduced to practical examples where they must determine the difference in quantity between two sets of items. For instance, they are asked to find out how many more pink gems Zach has compared to yellow gems. This visual and interactive approach aids in enhancing their understanding of the concept of difference.

The lesson continues with a series of activities that further explore the use of bar models. Students are given scenarios involving two characters, Rosie and Esin, with different numbers of books. They are tasked with determining who has more books, who has fewer, and the total number of books they have together. These activities are structured to encourage students to think critically and apply their knowledge of finding differences using bar models. The lesson concludes with independent work where students use bar models to answer questions and identify the odd one out in a set of problems, allowing them to demonstrate their understanding of the concept in a variety of contexts.