An aquarium is filled with fascinating sea creatures. There you'll see fish, sharks, sea otters, penguins, jellyfish, and sting rays. Dive into learning subtraction as you read about the animals at the aquarium. This nonfiction math reader builds mathematics and literacy skills, combining informational text, problem solving, and real-world connections to help first grade students explore math in a meaningful way. Let's Do Math! sidebars feature clear diagrams that provide students with opportunities to practice what they've learned. The Problem Solving activity enhances the learning experience and promotes mathematical reasoning, and Math Talk includes questions that develop students' speaking, listening, and higher-order thinking skills. Informational text features include bold font, headings, captions, a glossary, an index, and a table of contents to help students navigate the text and increase comprehension. With dynamic images and high-interest content, this e-book will engage students in reading and learning.