NUMBER SYSTEMS

Natural Numbers

The numbers we commonly use for counting are called Natural Numbers.

1, 2, 3, 4, 5, ...

The dots ... mean that the numbers continue forever.

1 book

2 books

3 books

4 books

KEY IDEA

Natural Numbers are used for counting.

There is no largest Natural Number.

No matter how large a Natural Number is, we can always add 1 to get another one.

1000 + 1 = 1001

BUT WAIT...

Natural Numbers help us count things.