La historia de: los sistemas numéricos: Valor posicional

Learn the history of number systems with this engaging Spanish book! This text combines mathematics and literacy skills, and uses practical, real-world examples of problem solving to teach math and language arts content. Students will learn place value while reading about the number systems of the Egyptians and Romans, and also learn important vocabulary terms like cuneiform, binary systems, roman numerals, and more! The full-color images, math charts, and practice problems make learning math easy and fun. The table of contents, glossary, and index will further understanding of math and...

What better way to portray bioluminescent creatures of the sea, earth, and sky than in a glow-in-the-dark book? Scientific researcher María Emilia Beyer reveals the truth about these animals that produce their own light using special substances, as well as how they use this ability to search for food, defend themselves from prey, communicate, and find a mate. Readers will find eight species of bioluminescent plants and animals and can turn out the lights to see them in all their splendor--and read special hidden text!

El libro que ayudará a todos los niños a entender cómo es el Cielo y qué pasa cuando muere un ser querido. La muerte es un tema difícil de abordar con los niños. Este libro es la ayuda que padres, maestros y adultos que tengan niños a su cuidado estaban esperando para comprender el tema en sus propios términos. Con textos sencillos, dirigidos a los niños, y hermosas ilustraciones, la doctora Elsa Lucía Arango explica cómo es el Cielo y qué pasa con los seres queridos que mueren. El libro cuenta además con la asesoría de la reconocida psicóloga Annie de Acevedo para ayudar a los ...

"In this heartwarming book, brother and sister, Mark and Sara, discover the story behind the poinsettia plant--the Christmas flower (las flores de la Nochebuena)--as their family experiences the best Christmas ever."--Cover back.

Saving and spending are building blocks of the economy. Readers will learn about various sources of income as well as concepts such as how saving a little at a time can eventually add up to a lot of money. This informational text explains ideas such as keeping track of expenses, financial goals, budgeting, and investing. Readers will learn about different types of savings plans, such as those for college and retirement. This resource also includes the ideas of donations and philanthropy.