These thematic pictures of Математика are analogous to a visual dictionary. The theme "Математика" is split into several parts. For children, especially toddlers from 1 to 5 years old, it is better to divide the sets of cards over several days, or even weeks, so that the information is absorbed better. This is especially true if you are using flashcards to learn erzya language that is not your native language.
To expand your erzya language vocabulary on the "Математика" topic, flashcards games are the best way: