When do we see negative numbers? We would of course see them on calculators, math class, and maybe even on math topic restaurants but the place where you would see them is when you solve a problem like what is 2-4 and the answer would be of course negative 2. That's way that you solve that problem is by first learning the number line including the negative numbers. So for example if right now I were looking at a number line that goes form -4 to 4 I would see it like this: -4, -3, -2, -1, 0, 1, 2, 3, 4, and of course it continues.
Negative numbers are very hard to find in everyday places because how many times a year are you going to run into a store or person or anything like that, that is going to have a bunch of negative numbers. Most of the time negative numbers are usually in math problems that can help you with everyday things. Some of the everyday things that negative numbers can solve for you in science and many of other things.