Being able to do quick basic math is also very useful outside of business. A lot of people have no idea how much financing of something like a car will really c

Being able to do quick basic math is also very useful outside of business. A lot of people have no idea how much financing of something like a car will really cost them. Or the decision buy vs rent. Obviously there are a lot of other factors and you will want to check your numbers before making a final decision but I find it very useful to make a quick calculation as a baseline.