If you are using the companion workbook ( рабочая тетрадь ), you can find specific page-by-page answers on GDZ.ru (Workbook) .
In Part 2, understanding why an operation comes first (like multiplication before addition) is more important than just getting the right sum. ddz po matematike 2 klass rudnitskaia 2 chast
ГДЗ по математике 2 класс Рудницкая, Юдачева Решебник If you are using the companion workbook (
Identifying polygons , calculating perimeter , and understanding the properties of a circle/circumference. Юдачева Решебник Identifying polygons