Description: Threading the string through the holes, fixing it around a certain button, the child thus highlights the necessary numbers and signs for solving mathematical problems (addition, subtraction, equalities, inequalities, more, less).
Age: 3-7
Contents: Playing board (280x200 mm, plywood, silkscreen) in the form of a steam train with three rows of buttons (1st - numbers of the first ten, 2nd - digit 0 and arithmetic signs, 3rd - numbers of the second ten); string; instructions..
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