As a parent, you will always want your children to have the best and most healthy ideas about money possible. It is true, the idea they develop about money at their early age will define a lot of concepts they will use when they grow up. In fact, it has been proven that those individuals who had the opportunity to work and understand money at early ages have a better ability to manage their economy than those who didn't.
See, childhood is the most important period of life when it comes to knowledge and conceptualising. More than an 80% of everything we ever learn is stored in our minds during the first 10 years of life. If you are able to show them the value of money during these years, be sure that they will have a lot less difficulty managing theirs when they grow up.
Surely, you want your kids to have a successful economical life when they grow up. That is why you are looking for ways to teach them about money. Well, the first thing you should do, if they are old enough, is show them how to work. Of course, don't force them to work in an office or anything. Try showing them some house duties, and pay them small amounts of money every time they complete an assignment well. Little by little they will understand that money is hard to get. Show them how to save, by acting as a bank. Tell them you will save their money and they will get to use only until Christmas, for example. By Christmas they will be able to identify how all their efforts were worth it.