To help children memorize basic calculation combinations.
The box includes:
a short guide describing the principles of the Montessori methodology, the purposes of the provided material and the correct way to use them, with step-by-step explanations of the activities and of the work environment;
a wooden addition table;
a wooden subtraction table;
17 neutral rods and 18 coloured rods: blue and red;
online resources, accessible through the code shown in the guide.