In a three-digit number the digits go in columns.

Hundreds |
Tens |
Ones |

Look at the number:

345

Put each digit in the columns like this:

Hundreds |
Tens |
Ones |

3 | 4 | 5 |

So **345** is **three hundred**, **four tens** and **five ones**, which is **three hundred and forty-five.**

And **504 **is** ****five hundred**, **no tens** and **four ones**, which is **five hundred and four.**

Hundreds |
Tens |
Ones |

5 | 0 | 4 |