In Module 3, Lesson A1, the students use a meter strip to practice meter strip subtraction. Here is a file you can use for that purpose. When you print the file, be sure to check "actual size." The first time I printed this the measurements were off a lot, but it was set to "fit" and that seemed to be the problem. You will see in the example I made there are only centimeters showing. Trimming off the inches made it easier to read.
After trimming each section at a point that made it easy to line up, I taped the pieces together. If you have an easier process or an inexpensive source of meter strips, please comment and share your suggestions. When you encounter a "high prep" lesson in the modules, consider what you have that you can just repurpose (possibly just demonstrate whole class with a meter stick). If you taught it whole class, could your students practice with this task in a small group at a center? A room-full of kids wielding meter sticks might get crazy, but I would think a couple kids could sit next to a meter stick on the floor and practice the subtracting a ten task. This way the kids can have the experience without you having to make or purchase a class set of the materials.
Why Would I Want to Use That?
With so many mathematical models and tools, how do you decide which ones are worth investigating? We have created this blog to help faciliate that discussion.