Planet of the Penguins — David LaRochelle

Math meets sci-fi in this clever chapter book -- the second in a new series -- about two numbers-loving friends and their alien adventures.
 
Lamar and Lexie head off on another math-related adventure to help their new space alien friend, Fooz! It seems Fooz's planet has been overrun with penguins -- and the inhabitants are terrified of these adorable creatures. In fact, they're so frightened they turn to stone whenever they see even the tiniest baby penguin. To rescue Fooz and his fellow aliens, Lexie and Lamar must solve a series of equations, including reading map coordinates, determining area, interpreting Roman numerals, and understanding percentages. Can they do it all and save the day?