Basic concepts of grouping objects. How to use these resources effectively:
Make sure the site matches the year your textbook was printed, as task numbers sometimes shift in newer editions. reshenie zadaniia po matematike 2 klass moro stranitsa
Depending on which page you are on, you might be working on: Basic concepts of grouping objects
For 2nd-grade math, there are several reliable Russian educational platforms (GDZ) that provide detailed explanations: reshenie zadaniia po matematike 2 klass moro stranitsa