Adding & Subtracting with Visual Texts
This mathematics lesson is designed for second grade students to further develop and solidify understanding of addition, subtraction, and the relationship between the two concepts. This lesson follows units I taught on both addition and subtraction. With partners, students will create visual representations (graphs, pictures, etc.) of key math vocabulary and the inverse relationship between addition and subtraction to review and reinforce these concepts. Presentation of these visuals will further student understanding of the concepts by providing additional visual examples and discussion.
Standards:
National Standard:
2.NBT.7. Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
State Standard:
2.2.4 Understand and use the inverse relationship between addition and subtraction.
Example: Understand that 89 – 17 = 72 means that 72 + 17 = 89.
Example: Understand that 89 – 17 = 72 means that 72 + 17 = 89.
NETS
1. Illustrate and communicate original ideas and stories using digital tools and media-rich resources. (1,2)
Learning Objectives:
1. Students will create visual texts of key vocabulary (addition, subtraction, sum, difference) to show understanding.
2. Students will create a visual representation of an addition and subtraction fact family in order to show understanding of the relationship between addition and subtraction.
Instruction and Activities:
Duration: 2-3 class sessions
Duration: 2-3 class sessions
Introduction:
Reread the addition and subtraction sections of the More M&M’s Brand Chocolate Candies Math book (used in prior separate lessons on adding and subtracting). Ask the students what the author used to represent the concepts of addition and subtraction. Answers: candy, M&M’s. Explain that visual texts can sometimes help us understand and remember a concept or vocabulary word easier than words alone can. Tell the students that during today’s lesson they will create their own visual texts to review and reinforce our key vocabulary terms about addition and subtraction.
Whole-Group Modeling & Practice:
Begin by showing examples of visual texts from the website: http://www.mathsisfun.com/definitions/addend.html using previously learned and mastered vocabulary terms like addend, even number, and odd number.
Discuss each example with the class and create a different visual text for each mastered vocabulary word that could have been created. Remind the students that several unique visual texts could be used to describe the same word. Model using different visual techniques - graphs, pictures, etc. Label each visual text with the term that corresponds to it. Ask for student ideas and input to create visual texts together as a class.
Partner Activity:
Display the vocabulary terms the students will be depicting in their visual texts. Explain that each partner pair will create a visual text for each vocabulary term and one fact family of their choice and assign partners. Provide the partners with ample time to complete their visual texts using writing utensils of their choice (This portion may extend to another class session). Walk the room to provide any support or redirection needed.
Conclusion:
Have each pair of students display their visual texts with the document camera covering their vocabulary label. Allow the other students to guess which term is represented by the visual text. Then have the partners explain why they chose to depict the vocabulary word or fact family in this way. If students were unable to guess the correct term, ask the pair what they would do differently now.
Materials:
More M&M’s Brand Chocolate Candies Math by Barbara Barbieri McGrath
Blank paper
Writing utensils - pencils, crayons, markers, colored pencils
List of key vocabulary (sum, difference, add/addition, subtract/subtraction)
Assessment checklist
Projector linked to a computer, overhead projector, white board, etc.
(any thing with an ability to display examples for students to see)
Document Camera (to project student work for class discussion)
Assessment:
The teacher will use informal assessments by observing student work, correcting, and reinforcing learning objectives throughout the lesson. The teacher can use the checklist provided to assess each student’s visual texts at the end of the lesson.
| Assessment | Name: Date: |
| Topic: Addition/Subtraction | |
| Checklist | Comments |
| Student creates accurate representations of key vocabulary terms & the fact family (5 points) | |
| Sum | |
| Difference | |
| Add/Addition | |
| Subtract/Subtraction | |
| Fact Family | |
| Provides a label or caption for each item (5 points) | |
| Uses a simple drawing that provides only the necessary details for each item (5 points) | |
| Can interpret information in the representations orally (5 points) | |
| | |
| Follow-Up: Total Points Earned: _____________ | |
Related Resources:
Tisha...I love that you also introduced your lesson using a book. I think it is helpful for our students to hear and see examples or real world uses of our lessons at the beginning of our lesson. I also find that it is a great way to visually "hook" my students into the new topic we are about to begin working on. Great lesson!!
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