Earlier this year I was really working on recognition of numbers 1-20 with my Kindergarten group. The teen numbers are really hard. After a lot of work with building the teen numbers (a ten and some more) we worked on recognizing and recalling the different numbers.
We played a game from the Kentucky Numeracy Project (one of my favorites). This game is called Mailbox Numbers
I set up the, "mailboxes" around the room and the students had to pick up the, "mail" and figure out what box to bring it too. The envelopes had different representations of a number. There were tally marks, the written numeral, ten frames, domino, and dice patterns. They had to count to figure out what number to deliver the mail to.