- This is the second book in the series to help your little one get introduced to math in a fun and engaging way. “Not Dan” has woven math into the story of One-A-Roo Sue who bounces her birthdays in one at a time! Watch the smile spread across your child’s face when they get the concepts of the math and love seeing the tricks Monkey Moe plays as the story unfolds. Fully illustrated by Eric J. Carter and full of detail to keep kids entertained and educated! Enjoy!