The most common way is that parents make three children, outside the topic is: Savings / Spending / Giving.
To get the money, the children need labor and the parents will pay. You can make a list of things that your child will be paid for, such as feeding dogs, watering plants, cleaning cars, packaging toy boxes ... My personal opinion is that you should not pay for things related to schooling and read. Only pay for child labor related. Funding may also come from the parents' weekly or monthly "benefits."
After getting the money, guide your children to divide the jars, in the following way: 20% of the "savings" vial; 20% of the "money to give" jars and the remaining 60% is in the "spending money". Discuss to see what the money in the jars will be used for, for example, the money spent will be used to buy breakfast, buy birthday gifts, buy toys, buy books