Numero Lingo is a great way to learn to translate numbers in any of six foreign languages: English, French, German, Italian, Portuguese, and Spanish.

By taking tests, even if you initially have no idea about the correct responses, you will quickly learn the proper translations as your incorrect answers are corrected. It is considered that this method of taking tests and learning from mistakes is the quickest and easiest way to learn.

The unregistered version tests you on numbers up to 2 digits long. The registered version increases this to 4 digits.