This Fluency Activity is a part of the Lesson 4, Unit 2, Grade 4. Isolated review builds fluency with conversion so that students can use this skill as a tool for solving word problems. 1 m 20 cm is how many centimeters? S: 120 centimeters. Repeat the process for the following possible sequence: 1 m 80 cm, 1 m 8 cm, and 2m 4 cm.