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

A young girl explains how she and her diverse group of friends are all different from each other. In this first-person nonfiction narrative, vibrant photographs reinforce the idea of a community of students who respect each other and live in harmony. A picture-word glossary is included.

One dog in a teacup, two caterpillars on a leaf, three horses having a conversation... Fun photographs and simple text help introduce young readers to counting numbers from zero to ten. A fish-counting activity encourages young readers to practice their counting skills.

Deserts may seem like harsh, uninhabitable places, but they support a diverse quantity of plant and animal life. And, they aren't always hot! Deserts serve an important role in Earth's existence, too. Readers learn about hot and cold deserts alike, as well as semi-arid and coastal deserts in this Spanish-translated title. From the Horned Lizard to the Saguaro cactus rooted in rich soil, the desert biome will amaze readers. This 6-Pack includes six copies of this title and a lesson plan.

¿Eres de los que creen que sólo los seres humanos se comunican? Si es así, aquí encontrarás más de un motivo para repensar las cosas. Si abres este libro conocerás los códigos secretos que diversas especies emplean para comunicarse y también verás reflejadas en otros seres muchas de las respuestas que creemos únicas y características de los humanos. Acércate y comprobarás que a veces estos códigos no se diferencian mucho de la manera en que nos comunicamos los humanos.