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The textbook was created in accordance with the State Standard of Primary Education and the Model Educational Programme developed under the guidance of O. Savchenko. The workbook is a part of the educational and methodological kit «Mathematics. 4th grade". The textbook presents a system of tasks for improving the computational skills and abilities of students to solve the main types of software problems. Using the QR code, you can quickly access additional material in the form of interactive tests. It is intended for students of the 4th grade of general secondary education institutions.