Since you are looking to download or view these for free, several reputable Russian educational platforms host them. You can usually find the solutions for both of the textbook:
While it’s tempting to just copy the answers, using GDZ as a is more beneficial:
Use it when a parent is unsure of the "Zankov system" logic, which can sometimes be non-traditional. A Quick Warning
Intense focus on suffixes and prefixes that change the meaning of the root.
Looking for "Ready-made Homework" (GDZ) for curriculum is a common task for parents and students using the "System of Zankov" program. This textbook is known for being slightly more advanced than standard programs, often focusing on deeper linguistic analysis. Where to Find Polyakova 3rd Grade GDZ
Polyakova’s curriculum moves faster than others. In the 3rd grade, students dive deep into:
Have the student complete the exercise first, then use the GDZ to find and correct their own mistakes.