The system of numbers that you use is called the **decimal system** and is based on powers of ten ( **base ten system**). Each place in the place value grid is ten times the value of the place to the right of it. Every number to the right of the decimal point is a **decimal fraction** (a fraction with a denominator of 10, 100, 1,000, and so on).

On the place value grid (see the following chart), notice that can be written as ten to a negative exponent, 10 ^{–1}. Similarly, can be written as ten to a negative exponent, 10 ^{–2}.