These thematic pictures of คณิตศาสตร์ are analogous to a visual dictionary. The theme "คณิตศาสตร์" splits 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 the information is absorbed better. Especially it is true if you are using flashcards to learn the thai language, which is not your native language.
To expand your thai language vocabulary on the "คณิตศาสตร์" topic, flashcards games are the best way: