NUMBER SYSTEMS

Why Do We Need Zero?

Natural Numbers help us count things.

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We can say that we have:

1 book, 2 books, 3 books...

But what if there are no books?

Natural Numbers begin with:

1, 2, 3, 4, ...

None of these numbers represents nothing.

KEY IDEA

We need a number to represent the absence of something.

Zero represents nothing.

NEXT IDEA

Now we have a new question: