For me, practical applications of math are about understanding how a system works. More often than not, it really doesn't matter what the exact number is that c

For me, practical applications of math are about understanding how a system works. More often than not, it really doesn't matter what the exact number is that comes out the end (the precision is often beyond my ability to act), but rather the understanding that well, if I take this action, these other things are going to happen at about this magnitude, so I need to offset them by doing something else, etc. etc.