Last year I attended a math workshop at our nearest Regional Professional Development Center and we were discussing how many students have difficulty learning the numbers 11-19, specifically. The presenter was kind enough to research a few things and she came up with this book for 11-20. I hope it will come in handy for some of you, too. If you aren't already a member, you can sign up for a free 7 day trial to print the booklet.


http://www.teachervision.fen.com/numbers/printable-book/54045.html