Most Russian schools follow specific textbooks. You can find ready-made solutions (GDZ) for these directly on platforms like Skysmart Solutions or Allmath.ru :
: Includes many logic puzzles and geometric figure analysis. 💡 Effective Ways to Use a Solution Program reshebnik po matematike dlia 2 klassa skachat programma
9 приложений для решения задач по математике, физике и не только Most Russian schools follow specific textbooks
: Focuses more on logic, complex equations, and advanced multiplication/division. and advanced multiplication/division.