Positive money management is a learned discipline. Children begin to learn math at an early age, this is the perfect opportunity to begin talking about money. Math and money have a strong correlation. Start utilizing money during your child's math lessons. Using a handful of coins to demonstrate adding and subtracting can be a powerful visual aid.
As your children get older, giving them an allowance (start with a low amount) and sharing with them your household's budget (e.g., rent, groceries, bills, etc.) will provide a realistic visualization for managing money.