- This is the eleventh, and last book in this series that helps take the scare out of math for your Kiddos. There is nothing too scary about skip counting by tens though. Ten-ti-pede Pete starts with no legs, but gets ten each birthday along the way. On birthday ten, Ten-ti-pede Pete has one hundred feet and is FINALLY able to walk! Where does he go? Can’t tell! But while Not Dan and Eric J. Carter are sad this series is ending, the ending to this book might be their best! Enjoy!