## The Lesson

The base of a power is the number (or other quantity) that is multiplied by itself.

## Dictionary Definition

The Merriam-Webster dictionary defines a base as "a number (such as 5 in 56.44 or 57) that is raised to a power."

## Understanding Bases in Powers

A power is the product of multiplying a number by itself. A power consists of a base and an exponent. For example, 32 is a power. 3 is the base and 2 is the exponent. This means that 3 (the base) is multiplied by itself 2 (the exponent) times. ## Real Examples of Bases in Powers

Some real examples of bases in powers are given below.
• The power below has a base of 4: • The power below has a base of 2: • The base can also be a letter. The power below has a base of a: ## Powers of 10

A power of 10 has a base of 10 and an exponent:

101 = 10

102 = 10 × 10 = 100

103 = 10 × 10 × 10 = 1,000

103 = 10 × 10 × 10 × 10 = 10,000

Notice that the exponent tells you how many 0s there are after the 1. Powers of 10 are useful for scientific notation.