Mr. Mordecai wrote:
Most importantly, though, I have two wonderful children. They are young, but they have entered the phase where my oldest (currently age four) is starting to learn serious lessons about money.
I think that what you are trying to teach your children about money is wonderful.
But I think you might want to read up a little on child development and learning. Some of the issues you've mentioned are typical - understanding that coins are symbols for "value" but not understanding the meaning of denomination are pretty typical. It usually takes a few years beyond 4 before a child can truly understand ranking much less relative value. In other words, at 4 the child might be able to count to 20 but probably does not understand the concept of 20 being greater than 1. Similarly, "5" as the word in the word in the counting sequence, "5" as the symbol written down or on a $5 bill, and a bowl with 5 objects in it might be completely different concepts to the child.
I'm not saying there is anything wrong with what you are doing or that you shouldn't keep doing it. But some of the things you've said are right out of the classic child development writers including Piaget! If your read up on some of that material you might be able to be even more effective at teaching your child about money.