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

¿Y si tu marido fuese tu peor enemigo? ¿Y si ni siquiera su muerte te librara de él? Cuando el barón Hamilton fallece de forma inesperada, su viuda, la joven Marian Fillmore, cree que por fin se verá libre de un esposo abusivo y maltratador. Sin embargo, las condiciones que establece en su testamento la obligan a permanecer atada a un lugar al que odia y a su cuñada, tan cruel y déspota como su hermano. La llegada del hijo del barón, procedente de América, será la única luz de esperanza en el porvenir de Marian. Solo él será capaz de cambiar su destino y el de las personas a las...

English Spanish Bilingual children's book. Perfect for kids learning English or Spanish as their second language. Jimmy the little bunny goes to the beach with his family. There he learns about the importance of helping others. When Jimmy's sandcastle is destroyed by the wave, they work together to build the bigger and better one. Everything works out better when we help each other. Jimmy el conejito va a la playa con su familia. AhI aprende sobre la importancia de ayudar a los demAs. Cuando el castillo de arena de Jimmy es destruido por una ola, trabajan juntos para construir uno mAs grande...

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther. This 6-Pack includes six...

Read Along or Enhanced eBook: What do you do if you find yourself stranded at sea? This useful, Spanish-translated nonfiction book gives readers the information they need in order to survive at sea. With essential tips and instructions, helpful diagrams and images, a bibliography, and a list of other useful websites, readers will learn everything they need in order to survive--from the dangers of hypothermia, what to do if there's only saltwater available, and other useful survival skills.