The beauty of calculus is that you actually understand the Real World.

For example I taught my daughter factions this way.

Me: "These factions you see them? Now see these decimal points?"

Her: "Yeah I hate factions they are stupid!"

Me: "Factions are the only consistently real numbers below 1 and decimal points for the most part are made up numbers. 1/3 is 1/3 and never .3333."

Her: "I always thought it was the otehr way around."