12 Sets of Free Printable Flashcards - Flashcards can be a really fun and effective way to teach our kids. Memorization is important when they’re learning their letters, numbers, colors, etc. and flashcards have been proven to be one of the best tools for memorizing, especially for visual learners. This collection of flashcards are awesome because they don’t cost you anything and you can grab them quickly just by downloading and printing. No trip to the store or online order.