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Mathematics is a part of a child's world. It is not only interpreting numbers or mastering tricks of addition or multiplication. Mathematics is about ideas. These ideas have been developed to explain particular qualities such as size, weight, and height, as well as relationships and comparisons. Yet all too often the important part that an understanding of math will play in a child's development is forgotten or ignored. The photographs and text in these books have been chosen to encourage talk about topics that are essentially mathematical. By talking, the young reader can explore some of the central concepts that support mathematics. It is on an understanding of these concepts that a child's future mastery of mathematics will be built. This book teaches children about sorting. Each page has a full-color illustration.