This intriguing title teaches readers the history of number systems. From Egyptian times to the modern day, this Spanish text covers the number systems of the Roman Empire, the Maya Empire, the Inca Empire, Babylon, and India. This full-color book teaches students about operations and algebraic reasoning, introducing them to new concepts and vocabulary terms like place value, rounded numbers, exact numbers, the binary system, and more. Primary sources like maps, images, and illustrations will engage students and make learning about math topics fun and enjoyable. Text features such as a glossary, index, bold print, and a table of contents increase understanding and build academic vocabulary. The DOK-leveled Math Talk section includes questions that facilitate mathematical discourse and activities that students can respond to at home or school. Let's Explore Math sidebars and the extensive Problem Solving section provide ample opportunities for students to practice what they have learned. Learning number systems is fun and easy with this engaging grade 3 math reader!