In the expression 10^4, 10 is the base and four is the exponent. Whenever 10 is the base, the expression is quickly simplified by writing a one followed by the number of zeros named by the exponent. In the above example, 10^4 is written as one followed by four zeros, or 10,000. The expression 10^2 power is written as one followed by two zeros, or 100, and 10^3 is written as one followed by three zeros, or 1,000.