In the real world there are tolerances, so at my job I rarely have to get the correct answer which can be really hard, I just have to get close to the correct answer which can still be hard, but compared to actually solving the problem, it's a lot easier.

Now because I work in a textile mill, the tolerance I usually get is 0.125 inches which is huge. I usually go all the way down to 0.0001 inches because I think it's funny, and also I do have aspirations beyond just working with textiles.