I am not planning to make a class set, but will make enough for shoulder partners to share and introduce them in a whole group setting. I envision these being used for the most part in small group work by the students who struggle with rounding.
There are two parts to the visual; print as many copies of the background page as needed. The number lines have five on a page. Laminate, and attach a number line to the top of the background page with a small brad (I used a seam ripper to make small holes to get the brad through).
In this one we are rounding to the nearest hundred. Students, of course, may need to write more of the numbers on the number line to really understand what is being shown.
If you think this might be helpful for your students, click here to download it.