While Tikunova L.I. is a lead author, you might also see Korepanova M.N. listed on the cover, as they often co-author these materials.
Sites like Labirint or Ozon often have customer reviews where parents share photos of completed pages or discussed difficult exercises. reshebnik tikunova shkola gramoteev 4 klass
Many Russian educational sites provide scanned answers or typed keys. You can look for them on platforms like GDZ (ГДЗ) by searching for "ГДЗ Школа грамотеев 4 класс Тикунова." While Tikunova L