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Regular work with this manual will help 3rd grade students automate their computational skills, become more attentive and independent. The guide is primarily intended for training, so it does not provide for exercises in calligraphic writing of numbers - mostly lines are used instead of cells. In addition, we suggest ways to complete the expressions 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. Students can self-assess their performance on the topic by using the emoticons at the bottom of each page.