Reflection: Lesson Planning Division Bar Models - Section 1: Think About It


The answers I got from students today for the Think About It problem caused me to spend more time than I had planned on this section of the lesson.  For the Think About It problem, kids were asked to compare two work samples - one that showed a model for groups unknown and one that showed a model of group size unknown.  As I circulated around the room while students were answering, I saw many responses that resembled 'the models are different because the problems are different.'  The student answers were short and non-specific.  

Very few students identified how the two problems differed from one another or why the models looked different, even though both are division problems.  Up until this year, my students hadn't yet been pushed to do much writing in math class, and I needed to take this moment to start to teach them how to do so.

First, I pushed them to unpack why the models looked different, through whole class questioning.  I had a volunteer share his answer to the prompt, knowing that I'd get a non-specific answer.  I then shared that the answer given didn't give us enough detail.  It'd be like saying 'this burger is good because it's good,' I told them.  Yes, the problems have different numbers.  What else about them are different?  I let students share out as much as needed, until they started to dissect the contexts of the problem.  Students realized that one problem tells us how many friends Jeremy will share with (groups), while one tells us how many apples each teacher will get (group size).

Students helped me to construct an exemplar response on my page on the doc cam, and they recorded it on their own papers.  


  In the Moment Adjustment
  Lesson Planning: In the Moment Adjustment
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Division Bar Models

Unit 1: Number Sense
Lesson 9 of 19

Objective: SWBAT represent and solve division word problems by drawing a visual model.

Big Idea: There are two visual models that are very useful for division that will help us model every kind of division problem.

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7 teachers like this lesson
Math, Number Sense and Operations, division of Korea, factoring polynomial expressions, Decimals, division, quotient, bar models, divisor, dividend, visual representation, word problems, multiples, distributive property, greatest common factor, least common multiple, multiplying
  57 minutes
new doc 20 1
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