Learning German numbers from 1 to 100

Once you learn numbers 0 to 20 in German, you can effectively learn all of the numbers in German. The first 20 numbers make up the basis for all of the numbers in the German language. For example, to express the number 21, you just put together the word for 'one'(ein) and 'twenty' (zwanzig) and add 'und' in between them: 'einundzwanzig.'