Typically, vocabulary instruction is associated as part of reading instruction. However, vocabulary instruction is also a necessary component of mathematics instruction. In fact, state and national standards (e.g., Common Core State Standards) require elementary students to communicate about mathematics to provide clear explanations, construct coherent arguments, and critique mathematical reasoning. Students need to become proficient in mathematics language and vocabulary to meet these standards. This article provides guidelines for selecting which mathematics terms to teach, describes the vocabulary map routine used in Stevens et al. (2023), and provides a sample vocabulary map with step-by-step modeling.