This book is designed for grades 3-5 and provides step-by-step mathematics lessons that incorporate the use of the TI-15 calculator throughout the learning process. The 30 lessons included present mathematics in a real-world context and cover each of the five strands: number and operations, geometry, algebra, measurement, and data analysis and probability. This resource is correlated to the Common Core State Standards and supports core concepts of STEM instruction. Digital resources are also included for additional support.