La historia de los sistemas numéricos: Valor posicional (The History of Number Systems: Place Value)

Describe el trabajo hecho en la estación de policía, el personal, los procedimientos y programs de los oficiales de policía.

SOY UNA HOJA es un libro de la serie ¡Hola, lector! que cuenta acerca de la vida de las hojas y sus funciones. A los chicos les encatará saber que cada una de las hojas del patio de su casa tiene una vida muy particular. El texto es sencillo y fácil de leer.

How do you truly engage students in learning history? When students make personal connections to the subject, they’re much more motivated to learn. This Spanish book provides firsthand accounts of history that give personal insights into historical events. This primary source biography focuses on the life and times of Junípero Serra, the Franciscan missionary who created missions that stretched from San Francisco to San Diego. With a visually appealing layout, this book features captivating text, fun facts, sidebars, and time lines that help students grasp the essential concepts they need...

If a person were ever face-to-face with a huge, hungry animal with sharp teeth, they probably wouldn’t care exactly what that animal was! But from a safe location, can we tell whether it was a crocodile or alligator that wanted to take a bite? By examining their jaw structure, teeth, and other physical features, we can easily tell these two animals apart! Graphic organizers and amazing images highlight each animal’s habitat and other small differences between the two fearsome creatures, showing readers just what creature is lurking below the waters.