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Regular work with this manual will help 4th grade students automate their computational skills, become more attentive and independent. The guide is intended primarily for training, so it does not include exercises in calligraphic writing of numbers - sometimes lines are used instead of cells. In addition, we offer calculation methods and provide samples (in bold). In this way, adults can check the progress of students and, if a mistake is made, correct it together. And then the students practice calculations based on their experience.