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.
Nowadays, a lot of people are too dependent on calculators. Maybe because when they were young, they find math boring. We just need to teach our kids interesting and fun way in dealing with math. Math can be fun especially when you look at math in a completely different way.