A Problem Solving Approach to Mathematics for Elementary School Teachers has always reflected the content and processes set forth in todays new state mathematics standards and the Common Core State Standards (CCSS). In the Twelfth Edition, the authors have further tightened the connections to the CCSS and made them more explicit. This text not only helps students learn the math by promoting active learning and developing skills and conceptsit also provides an invaluable reference to future teachers by including professional development features and discussions of todays standards.