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

In Planes, emergent readers learn about planes and how theyre used as a mode of transportation. Carefully crafted text uses high-frequency words, repetitive sentence patterns, and strong visual references to support emergent readers, ensuring reading success by making sure they arent facing too many challenges at once.

Count, sort, and classify the dress-up hats, cowboy hats, and silly hats! Beginning readers will enjoy learning to classify and sort objects with this brightly illustrated Spanish book. Featuring vivid images and easy-to-read text, this full-color book develops students' math and reading skills and introduces them to early STEM themes. The Math Talk section includes questions that will increase understanding of basic math and reading concepts and develop students' speaking and listening skills. Learning math is fun and easy with this engaging text!

Todo fenómeno biológico, como es la sexualidad, se explica por causas próximas (anatomía, fisiología, conducta y su desarrollo) y causas últimas (adaptación y evolución), ambas en interacción con el ambiente natural y social de cada especie, además del sociocultural en los humanos. Específicamente en humanos, muchos especialistas solo tratan de explicar la sexualidad por causas próximas y en términos de conductas conscientes e influidas solo por lo sociocultural, lo cual no es incorrecto, pero ello es solo parte de la explicación, no se acude a las interpretaciones evolutivas....

Winner of: International Latino Book Awards 2014, Primer Premio en la categoría Best Young Adult Non-Fiction Book Focusing on key figures from the worlds of art, literature, music, politics, and science, this collection introduces young readers to luminaries who, despite the difficulties and failures of their childhoods, went on to accomplish great things. Readers will discover what individuals such as Jane Austen, Thomas Edison, Albert Einstein, Mohandas Gandhi, John Lennon, Pablo Picasso, and even the author himself were like as children and young adults, and draw inspiration from their...