: Offers detailed explanations for the 2019–2021 editions of the Part 1 textbook.
GDZ (Готовые Домашние Задания) for the 4th-grade mathematics textbook by M.I. Moro, M.A. Bantova, and G.V. Beltyukova (Part 1) provides step-by-step solutions to help students and parents verify homework. Online Resources for Answers
: Addition and subtraction techniques for large numbers.
: Focuses on clear, pedagogical explanations for primary school students. Key Topics Covered in Part 1