Strengthen teaching and deepen learning of number skills and concepts From "Mystery Number" to "Hot Lava Bridge, " the forty classroom-tested lessons in It Makes Sense: Using Number Paths and Number Lines to Build Number Sense promote the flexible use of number paths and number lines to solve problems and scaffold or document students' thinking. A wealth of teacher supports The step-by-step lessons are presented in three categories: Introductory ideas (focused on the structure and use of number paths and number lines) Lessons (activities that encourage the use of the tools for thinking about numbers, their magnitude, and their relationship to each other) Games (opportunities for students to develop numerical fluency, think strategically, and play cooperatively) The lessons offer a wealth of teacher support, including: strategies for differentiating instruction key questions to promote student thinking "A Child's Mind" insights sharing common student misconceptions "Math Matters!" tips highlighting mathematical definitions, research summaries, and learning scenarios teacher reflections more than thirty reproducibles, also available in a downloadable, printable format