R2: Subtraction algorithm and use tape How does the tape diagram diagram incorrectly. help you understand how (36 - 19 = 17) to solve the problem? R4: Addition algorithm and use tape diagram correctly. (39 + 19 = 55) 6. Summing up Are the students able Summary Statement: Sometimes we use to articulate in their addition to find a missing starting own words why we amount. used addition in this problem? Students will write a reflection about what they learned in their notebook. Are the students organically writing Teacher will choose 4-5 students to about the usefulness share their reflection for the group. of a tape diagram? Evaluation Does the lesson effectively support students in using diagrams, number sentences, and verbal explanations to explain and justify their thinking? Do students understand that in a situation, if the start amount is unknown “take-away” then we must use addition to solve? To what extent does the tape diagram help students to make of the story's context and understand the relationship between its numbers? Board Plan Reflection (to be added by the team after the lesson and discussion)
R2: Subtraction algorithm and use tape diagram incorrectly. (36 - 19 = 17) R4: Addition algorithm and use tape diagram correctly. (39 + 19 = 55) How does the tape diagram help you understand how to solve the problem? 6. Summing up Summary Statement: Sometimes we use addition to find a missing starting amount. Students will write a reflection about what they learned in their notebook. Teacher will choose 4-5 students to share their reflection for the group. Are the students able to articulate in their own words why we used addition in this problem? Are the students organically writing about the usefulness of a tape diagram? Evaluation Does the lesson effectively support students in using diagrams, number sentences, and verbal explanations to explain and justify their thinking? Do students understand that in a “take-away” situation, if the start amount is unknown then we must use addition to solve? To what extent does the tape diagram help students to make of the story's context and understand the relationship between its numbers? Board Plan Reflection (to be added by the team after the lesson and discussion)
ChavezGr2_subtraction_unknown_start.docx