Learning about money is inevitable so you might as well start now.
Go on a coin hunt and find change from around the house. Look in pockets, couch cushions, etc. Give a high five to the person who finds a coin in the most random place.
Now, have your children sort the coins based on how they look (color and size). Create a chart and make down how many of each coin you have.
Give your child a piece of paper and let him/her draw what the coins look like.
Tell your child what the coins names are and how much they are worth.
Now, put the coins in a bank :)