The article focuses on the problem to define the value of errors in operational-tactical calculations made with the use of mathematical formulae. Weak points of calculations under analysis have been pointed out. A mathematical apparatus has been used for the description. The aim of the article is to show how dangerous it might be to apply mathematical dependencies indiscriminately. The first part of the article contains the analysis of arithmetic operations errors. The dependencies presented in this part have been subsequently used for the analysis of selected examples. Several types of mathematical dependencies included in instruction concerning basic operational-tactical calculations have been analysed. Conclusions in the final part of the article included hints to be taken into account while creating this type of instruction.
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