Teaching the subject to an older child may be a bit more difficult. There are many math problems out there that can be used to bring it down to their level. Using this subject in an everyday situation is a one idea. For example, tell a story that involves that child. If he goes to the store and buys a gallon of milk with a five dollar bill and the milk is only three dollars, how much money will he have left? Using word problems will help the child understand it more.
A lot of people hate math. They say that it's boring. But don't you know that we use math in our everyday life? When we go to the supermarket and buy something, we use math in counting our change. We are also using math when we check the time everyday. When we ride the bus, pay the bills, building things, estimate the ingredients in cooking, budgeting our daily consumptions and the list goes on and on and on.