Math on the go

While out on a walk Sweet Pea requested that we bake banana bread when we got home. I told her that we couldn't because we didn't have enough bananas.
It went a little like this.
"We only have two bananas and the recipe calls for six. How many more bananas would we need?"
Sweet Pea thought about it for a few moments, then, "Four! We'd need for more bananas!"
"Good! How else can we make six?"
Sweet Pea came up with 3+3 and 1+5.
Looks like something is sticking. :)