## Reflection: Developing a Conceptual Understanding Think About Adding Nothing and a Little More - Section 3: Practice the Concept

During this lesson I noticed that when most students were practicing simply adding 0, 1, and 2 they were successful.  However, when I asked them to think about problems with missing addends many struggled to determine the correct addend.

I found that it would be helpful to have the students use two color counters to build each number sentence.  I would have them build the sum with one color counter.  Then I would have them flip over the counter to show the first addend.  I would then ask them how that model could show them what the other addend would be.  It may be necessary to guide them by asking question, such as: What counters show the sum? (All of them)  What counters show the addend we know? (The ones I flipped over), So how can we find out our other addend? (Look at the counters we didn't flip over).

When I was walking around monitoring their progress, I had to guide many student conversations about why they chose the addend.  This was the most meaningful part of the lesson to me because students often have difficulty at this point in the year explaining their thinking.  It is my hope that with more practice students will be able to explain their thinking more successfully.

Adding Nothing or a Little Reflection
Developing a Conceptual Understanding: Adding Nothing or a Little Reflection

Unit 2: The Mission of Addition
Lesson 5 of 8

## Big Idea: The big idea of this lesson is the understanding that the number relationships between 0 more than, 1 more than, and 2 more than lay the foundation for the basic addition facts with 0, 1, and 2.

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60 minutes

### Kristen O'Connor

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