**Deyan Mihaylov, Velina Yordanova**

*University of Economics – Varna (Bulgaria)*

**Abstract.** This paper gives a formalization of a problem for presenting a number by using particular set of equal digits and a range of math operators. Based on the formal definition, an example for presenting 7 in two ways by using 4 times the digit 2 is given. The first option is without any restrictions and the objective is to have the maximum possible number of solutions. For the second option there are some restrictions concerning the type and number of operations. The aim here is to achieve a result with minimum deviation from the constraints. Both options can be used as a type of math quiz for improving the cognitive way of thinking.

*Keywords:* Math Quizzes; Math Operations; Integer Numbers

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