Watch 123Movies. Children fall in love with the wonderful characters as they "Know the Numbers." This video was developed as a result of the extraordinary success that Conoce las Letras has had. Children who watch Know the Numbers easily learn the numbers from 0 to 10 in a few days. Know the Numbers is designed to instruct infants and toddlers to numerical characters during the stage when they begin to speak. You'll be amazed at how easily your little ones learn numbers!