Originally Posted by MrCjolsen

I think a good comparison, and one 4th graders can really wrap their heads around is time. Have them ask their parents how many miles they drive to work, and how long it takes them, on average.

Then have them report those numbers to you and get the average time and distance for the class. Then turn that into an average speed. Compare that to the average speed on a bike. Then see how much time is really saved by driving.

Another good comparitor is that between how long it takes them to get home on the school bus vs. on a bicycle or if their parents drive them.