This popular text addresses the urgent need for curriculum materials that cross traditional boundaries to include many of the elements that are integrated in the teaching/learning enterprise: mathematics content, teacher understanding, student thinking, teaching methods, instructional activities, and assessment. The book pushes readers beyond the limits of their current understanding of rational numbers, challenging them to refine and explain their thinking--without falling back on rules and procedures they have relied on throughout their lives.

By facilitating teacher understanding through the same kinds of questions and activities that may be used with children in grades 3-8, this book helps teachers build the comfort and confidence they need to begin talking to children about fractions and ratios. The many problems and activities included her, plus the clear distillation of complex ideas make this text a valuable resources for both pre- and in-service mathematics teachers.

New features and coverage in the third edition include:

• Even more student work and mathematical content incorporated into every chapter
• An increased emphasis on technology in the mathematics classroom
• More explicit connection to how teachers support students with a focus on sequencing instructional activities and differentiating tasks for various levels of thinking
• A companion website with additional examples, exam questions, and hand-outs of key visuals from the text.

This text is accompanied by an updated MORE--a supplement that is not merely an answer key but a resource that includes in-depth discussions of all the problems in the text; develops and extends discussion of the issues, teaching problems, and other considerations raised in the chapters; and contains additional problems--with and without solutions--that instructors may find helpful for assessment purposes.