Hallo, Leute! Why when we are counting in German, we say: "eins, zwei, drei...", but we say:"ein viertel Kilometer", "ein Kilo" and so on, however, without a letter S at the ending of the word which represents the number "one"? What is the difference between "ein" and "eins"? Must we apply the number form "eins" only when we are really counting in sequence? Why does this number-word loses its final S sometimes, and when does it occur? Thanks in advance!