Text: 3 stars 
 Illustrations: 3 stars 
 Not as good as the books in Brian Cleary's Words are CATegorical series, which I love. I have the following issues with this nonfiction picture book in the Math is CATegorical series: 
 - How tall and how wide are two totally different things, though they are not presented as such. 
 - Trees are measured in feet, not inches. 
 - Both the English and Metric systems are presented, which isn't an issue except the note explaining their usage appears before the book's text even starts. Many young readers will miss this brief piece of important information on the bottom of the dedication page.