Counting is the process of calculating the quantity of a group of objects. In math, quantity is represented using a number formed by the ten digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. This notation is called base ten.
Each of the ten base digits are associated with a quantity. As one counts a quantity of items the digits follow a pattern.
Shown below are the first 100 numbers used for counting.