A three-digit number is made up of

**hundreds**,

**tens**, and

**ones**.

The

**digits** in the number show

**how many** hundreds, tens, and ones.

The number of hundreds, tens, and ones in a number can be shown using a model.

One way to model a number is to use base 10 blocks.

A **flat** represents **1 hundred**, a **rod** represents **1 ten**, and a **unit** represents **1 one**.

Another way to model a number is to use a **tally chart**.

The tally marks show the number of hundreds, tens, and ones in the number.