The logarithm of a number using base

It is how many times we need to use

Examples:

• the natural logarithm of 7.389 is about

• the natural logarithm of 20.09 is about

Often abbreviated as

**e**(which is Euler's Number 2.71828...)It is how many times we need to use

**e**in a multiplication to get our desired number.Examples:

• the natural logarithm of 7.389 is about

**2**, because 2.71828^{2}≈ 7.389• the natural logarithm of 20.09 is about

**3**, because 2.71828^{3}≈ 20.09Often abbreviated as

**ln**
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