Ready-to-use answers for the by O.A. Zakharova and E.P. Yudina (part of the "Perspective Primary School" series) are available online for free.
You can find the specific solutions for parts 1, 2, and 3 through the following popular resources: reshebnik po matematike 3 klass zakharova iudina besplatno
Математика 3 класс тетрадь для самостоятельной работы (Чекин). Авторы: Захарова О.А., Юдина Е.П. Издательство: Академкнига. Серия: Ready-to-use answers for the by O
: Provides comprehensive answers for the 2018 edition and onwards. reshebnik po matematike 3 klass zakharova iudina besplatno
ГДЗ по математике за 3 класс, решебник и ответы онлайн
: Mastering the multiplication table and introducing division with remainders. Measurements : Converting units of length, mass, and time. Geometry : Calculating perimeter and area of basic shapes.