This Fluency Activity is a part of the Lesson 2, Unit 2, Grade 4. Isolated review builds fluency with conversion so that students can use this skill as a tool for solving word problems. Use color to customize the presentation of the Convert Units activity. Enhance learners' perception of the information by consistently displaying meters in one color (e.g., red), while displaying centimeters in a different color (e.g., green). In addition, use color to distinguish the two parts of the number bond.