Modeling a Subtraction Problem

Trixie was 2 years and 11 months at the time that this video was made.

The Problem

Trixie is playing with a collection of toy Sesame Street characters. She has 5 Cookie Monsters and 3 Big Birds. First I ask her, "Are there more Cookies or more Big Birds?" When she answers correctly I then ask, "How many more?" (This may be Trixie's first exposure to this type of problem - what I call "Hard Subtraction 1.")

What To Look For In This Video