This Problem Set is a part of the Lesson 12, Unit 2, Grade 3. This activity concretizes the relationship between a given number and its relationship to the tens on either side of it. Students also see that when embedded within specific, real, and varied measurement contexts, 73 milliliters and 73 centimeters (rounded or not) have quite different meanings despite appearing nearly synonymous on the number line. Provide students with the language and guidance to engage in discussions that allow these ideas to surface.