That's a clever way to involve your kids in financial literacy! My method is slightly more detailed but also focuses on visualizing our family expenses.
I use an app to track our monthly expenditures, categorized this time into five: Essentials (groceries, utilities, etc.), Transport, Health & Wellness (including health insurance), Entertainment, and Misc. I find that seeing where our money goes helps us decide as a family which expenses are essential and where we can cut back without sacrificing fun.