This Instructional Activity is a part of the Lesson 2, Unit 3, Grade 6. This task is an opportunity to assess students' prior knowledge of standard units of length and find out the kinds of objects students already use as benchmarks for estimating length units. Note that groups will likely produce their length of string pretty quickly. The majority of the time in this activity will be spent comparing and discussing with the whole group. Expect some students who are assigned 1 meter to say that it is basically the same as 1 yard (which is acceptable during the group work). Be sure to address this in the class discussion.