Modeling - Easy Addition

Trixie was 2 years and 8 months at the time that this video was made.

The Problem

Trixie is playing with her xylophone, counting something on my T-shirt, when I see an opportunity to introduce an Easy Addition problem. "I have 5 fish over here, and 5 fish over here. What I want to know is how many fish I have altogether."

What To Look For In This Video