This web application translates any cardinal number into Spanish.
It also explains the translation rules to help you understand how
to write out numbers in Spanish.
You can enter single
numbers (eg. "11"), number ranges (eg. "1-50") or comma separated lists of
numbers (eg. "1001,1000001"). If you like, you can challenge the application
a bit and try out very large numbers as well.
Here are some examples: