This volume investigates the foundational strategies for developing computational fluency and estimation skills in fifth-grade students. Marlene Kliman, an experienced mathematics educator and curriculum developer, utilizes the Investigations in Number, Data, and Space framework to guide students through complex arithmetic operations. The text argues that by building upon previously acquired numerical knowledge, students can develop more flexible and efficient mental math strategies.

Educators frequently cite this series as a standard for inquiry-based mathematics instruction in elementary classrooms. Experts highlight the text for its focus on conceptual understanding rather than rote memorization of algorithms.