First dozen / Premiere douzaine: numbers 1 - 12 (On the French-style mat, the square marked 12P) Middle dozen / Moyenne douzaine: numbers 13 - 24 (On the French-style mat, the square marked 12M)Last dozen / Dernier douzaine: numbers 25 - 36 (On the French-style mat, the square marked 12D)
For columns and dozens, the bet covers 12 numbers, which means that the odds are 31.58% and 32.43% for the two versions, respectively. These pay 2:1, so a successful bet ofR$100 on a column will result in aR$200 profit, plus theR$100 bet back.