This document provides strategies for teachers to incorporate writing into mathematics lessons to deepen student learning. It discusses how writing can help students understand mathematical concepts and processes. The document recommends teachers have students write to explain their thinking, summarize lessons, describe how to solve problems, and reflect on their learning. Specific strategies are presented, such as using journal prompts to explore students' attitudes and having students apply the "journalists' questions" to topics. The goal is to help teachers effectively integrate brief writing activities into their math instruction.