Dear son or daughter,
Math makes the world go around. It is all measured, down to the money you save to buy your car, the amount of gas you will need to put inside it to run, the money you spend at the mechanics and how to figure out if you were ripped off based on the parts and labor. It is the amount you need to take out that cute girl you like and let's face it, girls like money. It will help you figure out how long you've been dating her and how much you'll need to work to save up for that ring you want to get her.
It tells you how much you will have to work or sell in order to buy those great shoes you saw and if they are on sale, how much you will get back in change so you can buy that lipstick.
It is the paycheck you get, based on the hours you worked, minus the days you took off to pay for that concert you called in sick for, and drove hours to get to. It is the mileage you spent to get there and the route you decided was best. It is the total in your bank account and how much you take out. It helps you pay your bills and helps you budget so you can survive.
Philosophy is the reasoning it took to figure all this out. Put them together and you have a grand life filled with happiness and everything you wish for. Don't put them together means you will be living at home with your parents for a long time and we don't want that. We will be on vacation and we will not give you the key. Please make sure you do well in school or you will have no where to live.