CONCEPT CHECK The following conversation actually took place between one of the authors of this book and his son, Jack, when Jack was 4 years old.
DADDY: “Jack, what is 3 + 0?”
JACK: “3.”
DADDY: “Jack, what is 4 + 0?”
JACK: “4. And Daddy, string plus zero equals string!”
What property of addition did Jack recognize?
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