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The content of the textbook meets the requirements of the current mathematics curriculum for the 3rd grade of secondary schools (including the latest changes) and organically combines the functions of a textbook and a workbook with a printed base.

The publication consists of three parts, each of which contains texts of rules, samples of reasoning, tasks for updating basic knowledge, creating a problem situation and solving it, primary consolidation, formation of skills and abilities, and continuous repetition. Each part contains an appendix "Working independently" for students to work independently in class and at home. The textbook offers tasks of a propedeutic nature (marked "For those who want to know more"), which will contribute to the successful assimilation of the relevant material in the course of further study.

The material is presented in an interesting and accessible form, taking into account the psychological characteristics of third graders.

Intended for 3rd grade students of secondary schools and primary school teachers.