This teaches children budgeting in a very simple way. You can keep it really simple or make it more adult by adding a pretend income with pretend expenses. You can also discuss different budget ratios. Encourage your children to save with a piggy bank that breaks up the categories for them (a bank for savings, one for tithing, one for fun). You can also make a chart next to their piggy bank that keeps track of what amount goes where. At the end of the month they'll know how much they have to save, how much they can spend on fun things, etc.