Every multiple determines the number of bets to be paid for.
*What is the complementary number?
The complementary number is an extra number which is extracted during the draw to give players a chance to increase the prize paid out to those who have hit five of the six numbers of the winning combination. You do not choose a complementary number: this is and has to match one of the numbers of your combination, assuming that this combination also includes 5 out of the 6 numbers of the winning combination. The complementary number thus only applies to the 2nd prize category.