If you need a digital "program" to solve problems on the go, these apps are highly effective:
: Focuses more on logic, complex equations, and advanced multiplication/division. reshebnik po matematike dlia 2 klassa skachat programma
Most Russian schools follow specific textbooks. You can find ready-made solutions (GDZ) for these directly on platforms like Skysmart Solutions or Allmath.ru :
9 приложений для решения задач по математике, физике и не только