# Types of Numbers

### Topics

Multiplication by 1. We bet you like the sound of that. And well you should. It's as simple as it sounds.

Mathematicians call 1 the **multiplicative identity**, meaning that any number multiplied by 1 gets to keep its identity. Any number multiplied by a number other than one is immediately given an alias and escorted by a U.S. Marshal to a farmhouse in Iowa as a member of the Witness Protection Program.

When we find equivalent fractions, what we're really doing is multiplying by a cleverly disguised form of 1. We're talking fake mustache, glasses, a wig made out of real human hair - the works.

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