What's happened to the addition, subtraction, multiplication, and division you learned in school? And why are your children talking in math class and sharing answers? In friendly, jargon-free language, It's Elementary: A Parent's Guide to K-5 Mathematics not only decodes current teaching practices but also demystifies the fundamental concepts that your children need to understand to be successful math learners-and you need to grasp to help them. Illustrated with numerous examples of real students' classroom work, It's Elementary shows you how children progress in their mathematical thinking...