My teaching partner loves using number lines when we are working on addition and subtraction. So I came up with this idea but I forgot about it with all the end of the tear craziness. Once I pack things away I am on to the next idea. However, this really was a great scaffold for our kids who did not really understand this concept and the color coding with unifix cubes was very effective. You can run these off and even color code the backpacks (just the flap would be enough) for those little ones who need more practice. To build their language you could use real objects that might go in a backpack (crayons, little pencils, mini erasers,etc.)
What do you think of this?