Addition and subtraction within 20 - Compare number sentences - Presentation

In a comprehensive presentation designed to enhance mathematical fluency in addition and subtraction within 20, students are challenged to compare number sentences using inequality symbols. The lesson encourages the understanding and use of symbols such as less than (<), greater than (>), and equal to (=), and poses questions to stimulate discussion on their meanings. Through a series of engaging activities, learners are prompted to consider whether it is necessary to calculate exact answers to compare different calculations, thereby deepening their conceptual understanding of number relationships and operations.

The presentation progresses with practical exercises where students are tasked with selecting the appropriate inequality symbol to compare pairs of number sentences. For example, they must decide which symbol correctly relates expressions like 5 + 4 and 4 + 5 or 13 + 3 and 9 + 6. Additionally, the lesson includes reasoning tasks that require students to apply their knowledge in real-world contexts, such as determining who has more sweets left after eating a certain number. These activities not only solidify the students' grasp of comparing quantities but also foster critical thinking and reasoning skills in a mathematical setting.