If you need a digital "program" to solve problems on the go, these apps are highly effective:

: Includes many logic puzzles and geometric figure analysis. 💡 Effective Ways to Use a Solution Program

: A powerful tool that not only solves problems but also provides related learning materials and graphs.

: Covers numbers up to 100, the multiplication table (2–5), and basic geometry.

Most Russian schools follow specific textbooks. You can find ready-made solutions (GDZ) for these directly on platforms like Skysmart Solutions or Allmath.ru :