Number cards are educational tools used to help children learn and understand numbers. They typically display a number on one side and may include corresponding images or dots to visually represent the quantity. These cards can be used for various activities, such as counting, matching, and simple arithmetic, making them versatile for early math education. Teachers and parents often use number cards in games and interactive lessons to engage children. They can be found in different formats, including flashcards, posters, and digital apps. Number cards are effective for developing number recognition and foundational math skills in young learners.