the author of this app says:
Num-Num is an small program which changes a number to its verbal equivilant. A number can be converted to money, year, ordinal or cardinal.
Num-Num also lets you step through numbers sequentially so you can learn how to count as well as translate the numbers. All aspects of the program are addressed inside the help index.
Num-Num contains rules for English, French, German, Spanish, Itlaian and Dutch. The rules for spelling a number are external to this program, so adding languages is simple.