“…The use of this board admitted that the child exercised the ability to see the line as a unit and to establish the relationships between these units. Oliveira (2017) tells us that, to reach the first objective, it was necessary to ask the child to reproduce four lines on the blackboard and write the number 4; five lines and write the number 5, and so on, because "reproducing lines was also the time to write numbers" (OLIVEIRA, 2017(OLIVEIRA, , p. 1026. Besides, observing this table, the teacher could ask questions involving operations of addition, subtraction, multiplication and division, mentally, without the need to register the signs (+, -, ×, ÷).…”