## Reflection: Developing a Conceptual Understanding Put It All Together - Section 2: Develop the Concept

During this lesson I quickly learned that students had spent too much time working with the Part/Part/Whole model with subtraction.  When they got to the problems of comparison, they knew to subtract (something they hadn't known before. Yay, progress!) but they continued to use the part/part/whole model instead of thinking about how they could use cubes or draw a comparison model.

I found that it was necessary to spend a bit more time with determining the difference between separating problems and comparison problems and why you can't use the part/part/whole model.

Developing a Conceptual Understanding: Putting It All Together Reflection

# Put It All Together

Unit 1: Addition and Subtraction Basic Training
Lesson 7 of 7

## Big Idea: As mathematical thinkers we must use the information from a real world problem and determine what is the correct method to solve the problem.

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65 minutes

### Kristen O'Connor

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