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 The textbook is compiled in accordance with the requirements of the NUS Model Mathematics Curriculum for Grade 1, developed under the guidance of O. Savchenko and R. Shyian for general secondary education institutions. The publication combines the functions of a textbook and a workbook with a printed basis. The material of the textbook will contribute to the formation of a system of educational and cognitive knowledge and skills to apply them in practice. For grade 1 students and primary school teachers.