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**Polygons for the Secondary School**

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**Reflexive Approach in Mathematics Education**

*Lilyana Karakasheva*

**On the Project Method for Creating Methodological Competence in Prospective Teachers**

*Stanislava Koleva, Katya Chalakova*

**Interactive MozaBook Lessons and Teaching Mathematics in Bilinguals**

*Zdravko Lalchev*

**For Durer’s Numerical Squares (in Classes in Recreational Mathematics)**

*Ivanka Marasheva-Delinova*

*Marin Marinov, Petya Asenova *

**Investigating Some Properties of Quadratic Curves with Computers**

*Veselin Nenkov*

**A Generalization of van Lamoen’s Theorem**

*Veselin Nenkov, Stanislav Stefanov, Haim Haimov*

**An Application of Quadrilateral’s Geometry in Solving Competitive Mathematical Problems**

*Rosen Nikolaev, Tanka Milkova*

**Special Features of Constructing Numbers in Roman Numerals**

*Nina Patronova*

**The Role of the Individual in the History of Russian-Bulgarian Relations of SAFU**

*Maria Pavlova*

**Development of the Project “Experimental Mathematics” for Schoolchildren**

*Natalia Pavlova, Dragomir Marchev*

**Reflection in the Game Approach**

*Petar Petrov, Yordan Ivanov, Asen Velchev, Stanislav Stefanov *

**Innovative Practices in Mathematics Education in Bulgaria**

*Raisa Ovchinnikova*

**International Russian-Bulgarian MITE Project in Arkhangelsk Region**

*Tatiana Sergeeva, Nina Pronina*

**New Formats of Mathematical Education**

*Maria Shabanova, Lyubov Shestakovа, Natalia Getmanskaya, Olga Bezumova, Svetlana Malysheva*

**New GeoGebra Features for Converged Student Projects**

*Tatiana Shirikova *

**About Preparation of Pupils of the Arkhangelsk Region for Olympiads and Competitions in Mathematics**

*Diana Stefanova*

**Trigonometric Substitutions in Some Systems Rational Equations (Part II)**

*Tsvetelina Zhelyazkova, Dobrinka Boykina*

**The Heuristic Problems – a Means of Conducting Reflective Activity**