box of subtraction with control board, 90 exercises - mathematic material


box of subtraction with control board, 90 exercises | mathematic materialThe children learn in a simple way to calculate subtraction exercises. Respectively 2 numbers of the numeric field of 1 to 18 are subtracted. The board of control makes possible an easy control. Example of use: the child takes 1 practising tablet, for example 9 5 and looks for the corresponding result in the solution plate. Control check is done in reading the result on the control board. The article contains 1 keeping safe box with lid, approx. 26,5 x 16 x 5,5 cm; 1 control board, approx. 40 x 16 cm; 90 practising plates; 90 solution plates

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