High-quality GDZ resources, like those on Webmath.ru , often include the rules or logic behind an answer. If a student gets a question wrong, they should read the accompanying rule to understand their mistake.
Use the workbook answers to help your child when they are genuinely stuck. 5th grade is a "transitional year" where kids need a balance of independence and support. Tips for Success in 5th Grade Russian High-quality GDZ resources, like those on Webmath
Breaking down words into their constituent parts (roots, suffixes, etc.). High-quality GDZ resources
Navigating 5th Grade Russian: A Guide to the Lvova & Lvov Workbook (2017) like those on Webmath.ru