Did you know that only 5% of the Earth's oceans have been explored? Underwater investigators are on a mission to find out more! These passionate people come from different backgrounds with interests that range from science to shipwrecks. But they all share a deep respect for life under the sea. Learn more about underwater exploration with this nonfiction math book that uses real-world examples of problem solving to build students' math and reading skills. Let's Explore Math sidebars feature math questions that challenge students to develop their math skills. A problem-solving section at the end of the book prompts students to reflect and apply what they've learned. Demystify math with this leveled book that makes learning math fun and accessible for kids ages 10-12 and appeals to reluctant readers.