To calculate the value of the representation of the abacus, depending on the position of the counters.
Didactic content
To calculate the value of the representation of the abacus, depending on the position of the counters.
Material
28 counters made of injected plastic, washable, of 8 x 4 mm. and 2 mm. thick / 0,315 x 0,157 inch and 0,078 inch thick.
Packaging
Translucent reusable case.
Size
24 x 20 x 3 cm. / 9,448 x 7,874 x 1,181 inch.
Ages
6 years and older.