> Clear as crystal? I hope so. Because now we’re leaving this diversion and going back to our multiples of ten from 50-90. > 50, halvtreds, is constructed of halvtredje and sindstyve: 2½ times 20 equals 50. > 60, tres, is the more simple tre (three) and sindstyve: 3 times 20 equals 60. > 70, halvfjerds, is constructed of halvfjerde and sindstyve: 3½ times 20 equals 70. > 80, firs, is the more simple fire (four) and sindstyve: 4 times 20 equals 80. > 90, halvfems, is constructed of halvfemte and sindstyve: 4½ times 20 equals 90. > when you say a number like 55, you are technically saying ‘five-plus-two-and-a-half-times-twenty’