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These thematic pictures of 數字 sou3 zi6 are analogous to a visual dictionary. The theme "數字 sou3 zi6" 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 cantonese(Colloquial) language, which is not your native language.
To expand your cantonese(Colloquial) language vocabulary on the "數字 sou3 zi6" topic, flashcards games are the best way: