La resolución de problemas

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...

¿Quieres ser la más glamurosa? Aprende a elegir la ropa adecuada, los zapatos que mejor combinan, los complementos más originales..., y atrévete con un nuevo peinado que te haga sentir única, diferente. Con esta útil y divertida guía llegarás a ser una diosa. ¡Hazte el mejor de los regalos!

La Semana Trágica, las huelgas, las luchas y la necesidad del sufragio femenino, las políticas de la infancia en una trama social en gestación, las prisiones, los trasfondos multicolor del yrigoyenismo, la epidemia de gripe, los recovecos del arte: todo pasa por Katherine Sophie Dreier, singular y generosa mujer de vanguardia, a través de una lente estadounidense convertida en audaz caleidoscopio, lo que hace de este libro un relato fascinante del viaje que esta singular mujer emprendiera por Argentina entre 1918 y 1919.

This Spanish-language series presents the complete range of math concepts and skills students are expected to master during the first grade. The series moves sequentially, from easiest to hardest concepts, with each book covering a different math topic. The first volume reviews the math concepts students learned in kindergarten. The next six books cover counting, adding and subtracting, tables and graphs, money, patterns, and measuring. The eighth volume is a summary of the math concepts students have studied throughout the year. Each book presents situations that show the relevance of math...