## Reflection: Adding Multi-digit Whole Numbers - Section 3: Concept development

As seen in my reflection video, overall, this lesson went well.

I believe the tape diagram is mostly taped to their brains at this point. :) My students really liked making the tape diagram with the cash register tape and taping it into their notebooks. I wanted to have them make it with the cash register tape for a couple reasons. One, I wanted to instill in the students that I think modeling or making a picture to help you make sense of a problem is really important. We've talked about Math Practice Standard 4 and how modeling is a habit of mind I want them to have. I tell them that when I get a math problem that I don't know how to solve, I usually start drawing a picture of it and model the parts I do know.  Often times, I see students stuck on a word problem, just sitting and staring at it as if the solution is going to magically jump into their brains. I want my students to be math warriors, armed with tools and strategies to solve problems.  Second, I think creating something engages different thinking skills and students are more likely to remember what a tape diagram is. The more hands on I can make things, the more likely my students are able to own that knowledge as their own.

The tape diagram got mixed reviews from students.  Some students commented that the word problem made so much more sense when they were able to put the parts they knew into the model to remind them that they were solving to find the whole, the unknown in these problems.  I think that as students begin experiencing more difficult word problems and subtraction word problems, the tape diagram will become a more useful tool for them.

Tape Diagram gets mixed reviews from students
Tape Diagram gets mixed reviews from students

Unit 8: Place value
Lesson 11 of 14

## Big Idea: In this lesson, students are introduced to a new model - a tape diagram - and use this model to add numbers.

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Standards:
Subject(s):
Math, Place Value, Number Sense and Operations, sum, modeling mathematics, tape diagrams, adding large numbers, addend
60 minutes