Authored by V.N. Rudnitskaya and T.V. Yudacheva, this is the official "paper" that explains the logic behind the tasks and provides all correct answers.
If you are looking for the official solutions and pedagogical context for this curriculum, you should look for the following materials: matematika rudnitskaia 4 klass otvet zadachi
Addition, subtraction, and long-form multiplication/division. Authored by V
Part of the "Nachalnaya Shkola XXI Veka" (Elementary School of the 21st Century) series, published by Ventana-Graf/Prosveshchenie. published by Ventana-Graf/Prosveshchenie.