Counting to 1.000 and Beyond

21 to 99
Join these: to these: Note that forty does not have a u but four does!

100 to 999
Write how many hundreds ("one hundred", "two hundred", etc), then the rest of the number as above.

In UK English use "hundred and".

1,000 to 999,999
Write how many thousands ("one thousand", "two thousand", etc), then the rest of the number as above.

Millions and More
Write how many millions then the rest of the number like above.

Examples:
Use the same method for:

Commas
When writing the number put commas every three digits like this:

1,006,101

When writing words some people use commas, some don't. Which do you prefer?
 * one million six thousand one hundred one
 * one million, six thousand, one hundred one