Reflection: Modeling How Addition and Subtraction are Related (Part 1 of 3) - Section 1: Introduction


More than the addition lessons, this lesson revealed those kids who prefer the number line model to the counter model or vice versa.  I've found that I tend to use both models depending on the context of the sum or difference; the more I teach this the more the models take shape in my mind.  So when a few students got confused by how to work with the counters today to model the relationship between addition and subtraction, I asked them to be patient and do their best.  I told them there will be a number line lesson soon that works with a similar concept.  I also let them know that just because they prefer number lines now does not necessarily mean they always will; but they might and that's okay too.

  Not Everybody Loves the Counter Model
  Modeling: Not Everybody Loves the Counter Model
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How Addition and Subtraction are Related (Part 1 of 3)

Unit 1: Rational Number Operations
Lesson 6 of 27

Objective: SWBAT write a sum as a difference using counters as a model

Big Idea: Students discover how a sum can be written as a difference by removing (subtracting) counters from a set.

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Math, Number Sense and Operations, rational numbers
  40 minutes
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