Rabot 3 Klass | Garmoniia:gdz Dlia Tetradi Dlia Samostoiatelnykh

The "Garmoniya" (Harmony) educational system's workbooks for independent work in 3rd Grade—specifically for Russian Language (by T.V. Koreshkova) and Mathematics (by N.B. Istomina)—are highly regarded for their focus on logical thinking but are often considered challenging without teacher or GDZ (ready-made homework) support. Overview of the Workbook Features

While designed for "independent work," some exercises are tiered in difficulty. The Labirint community reviews note that while the books expand a child's horizons, the wording of instructions can sometimes be confusing for a 9-year-old to tackle alone.

You can find these workbooks at major retailers like OZON or Wildberries .