# These People Did The Math For Completely Unnecessary, But Incredibly Interesting Calculations

February 24, 2020 16.5k votes 3.4k voters 107.0k views20 items

List RulesVote up the calculations that might be unnecessary, but are nevertheless interesting.

You might remember those seemingly unrealistic math problems that were given in school, for example, the ones where Sally is buying 18 watermelons, eating 13 slices of pizza, and walking 28 dogs. The subreddit r/theydidthemath takes this one step further, and solves complex, but completely unnecessary calculations. In spite of their apparent lack of usefulness, their calculations are often incredibly interesting breakdowns of random things that pique their curiosity. Inspired by everything from tweets to memes, here are some of the best calculations from r/theydidthemath.

- 1
## The Changes In Annual Tuition At Yale

Photo: rnusicality / Reddit2,271101Interesting calculation? - 2
## The Real Worth Of A Billionaire

Photo: u/Awesomeguy5507 / Reddit1,615127Interesting calculation? - 3
## Finding The Cumulative Amount Of Times Spent Urinating

Photo: u/CowboyState / Reddit1,21297Interesting calculation? - 4
## The Number Of Plants Needed To Replace The Oxygen You Waste

Photo: u/bthnp / Reddit59145Interesting calculation?