Seguin’s Boards 10 to 19 – Teen Board is a set of 2 rectangular boards which are divided by wooden strips to form 2 vertical sections and five orizontal sections. The boards have the number 10 printed on each of the 9 sections. The material includes number cards from 1 to 9, which can be inserted into the boards to enable the child to form the numbers from 11 to 19.