# Modeling - Hard Subtraction 2

Trixie was 3 years
and 4 months old at the time that this video was made.

**The Problem**

You have 4 chickens. You have 3 more chickens than I have.
How many chickens do I have?

**What To Look For In This Video**

- Trixie seems tired. (This is the third problem in a row for her and I may have pushed her a little too far for one sitting.)
- Trixie correctly gets started by counting out 4 chickens for herself.
- I always try to understand what logic leads children to their answers. My experience is that children who have been taught well rarely make random guesses. But in this case I have no idea on what basis Trixie decided initially that I have 5 chickens.
- But any guess at all is a good start. At least now we have 2 sets of objects (her chickens and my chickens) and we can discuss who has more, and how much more.
- It seems very clear that as far as Trixie is concerned, the
question "how many
__more__than me do you have?" means exactly the same thing as the question "how many do you have?" - It is interesting to compare Trixie's work on this Hard Subtraction 2 problem with her work on Easy Subtraction and her work on Hard Subtraction 1. All 3 of these problems were presented to her in one sitting.