I am attempting to teach the metric system to my fourth grade class. I tried with a number line and moving the decimal however many hops today, but the students gave me the deer-in-the-headlights look. They are ALL confused...even the ones at the top of the class! I will be trying to teach this again tomorrow (if we don't have a snow day - right now it's like a blizzard outside and we could end up with 12 inches). Does anyone have any ideas for getting metrics to make sense?