“But what about this wall? Was this always here?” Ted asked. $1$ replied, “No, this wall was not always here. During old times we along with our additive inverses and $0$ used to live together. During that time, this world was big and was called the world of __.”

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Solution

Natural numbers along with their negatives and zero are collectively called integers. They are represented on a number line. $0$ is in the center of the number line. The positive numbers lie on the right side of $0$ and the negative numbers lie on the left side of $0$ .
Therefore, this world was big and was called the world of _Integers_.

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“But what about this wall? Was this always here?” Ted asked. 1 replied, “No, this wall was not always here. During old times we along with our additive inverses and 0 used to live together. During that time, this world was big and was called the world of __.”

“But what about this wall? Was this always here?” Ted asked. $1$ replied, “No, this wall was not always here. During old times we along with our additive inverses and $0$ used to live together. During that time, this world was big and was called the world of __.”