I've seen pictures of these cups before but these pics from Sue Downing's blog really show how useful they are. We're going to be making these at school tomorrow. I think the kids will love "dialing up numbers" on them! I think they might be really helpful for adding 10, adding 100, etc. That's one thing my kids are having some trouble with. Ooooh, I can't wait to try these!
Visit Sue's blog by clicking on the pics. She has a link to directions for making them if you aren't sure how.