Mark J. Harasymiw 
Math on Mars [PDF ebook] 

Mars is perhaps the most thrilling planet these days. With rovers exploring its surface and manned missions in the works, people are wondering if Mars is our next home! In this high-interest book, readers will learn more about Earth’s neighbor, including what its climate and surface are like, why it’s called the Red Planet, and about the recent discovery of water on its surface. They’ll learn all this while solving "Your Mission" math problems that complement and support the text. This motivating volume is an engaging way to explore key aspects of science and math curricula.