This book serves as a tool that supports teachers in building knowledge of three critical areas that students use to achieve in mathematics: Number Sense, Problem Solving and Fluency. Number Sense focuses on building up to 3-digit numbers while focusing problem solving on the operations of addition and subtraction. Beyond building this knowledge, teachers will gain the ability to assess their students and identify shortcomings in these specific areas. Each chapter identifies processes, resources, tools, and strategies to impact kindergarten through second grade mathematics.