This document defines and describes thinking, reasoning and working mathematically (t, r, w m) and how it can be promoted in mathematics learning. T, r, w m involves making decisions about what mathematical knowledge to use, incorporates communication skills, and is developed through engaging investigations. It promotes higher-order thinking and confidence in doing math. The document outlines how t, r, w m can be encouraged in three phases of investigations: identifying problems, understanding concepts, and justifying solutions. Teachers can support t, r, w m through discussion, challenging problems, and reflection. The curriculum promotes these skills through real-world problems, investigative approaches, and connections between topics.