Междупредметните връзки – мотивиращ фактор за ново качество
Interdisciplinary Connections – Motivating Factor for Better Quality

Summary/Abstract: This work includes the study of competitive Informatics problems given to the first of the school year‘s national competitions in Informatics for competitive group E (4.-5. year), whose statements resemble mathematical models. This is a description of an approach to integrate knowledge and skills in Mathematics and Informatics by creating software for solving linear (arithmetic) equations with a single variable. These are the equations of type a + x = b, x - a = b, a - x = b, a * x = b, x / a = b and a / x = b where a and b are given positive numbers, and the variable x is sought in the set consisting of all natural numbers. This type of tasks for 10-11 year old students is known as finding variables and more accurately - finding unknown addends, minuends, subtrahends, divisibles, dividers and multipliers. Using the method of inversion, applied in solutions of arithmetic equations in mathematics, one can write code in C++ to solve problems, which find an unknown variable in a composite arithmetic equation with one, two, three or more operations. This work is designed for teachers of Mathematics and Informatics.

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