Students learn about budgeting rules and then apply their understanding in an interactive budgeting activity. Big idea: Following a budget helps make sure you have money for the things you need and want and still be able to save money regularly. Topic: Save and invest (Saving for long-term goals, Saving for short-term goals), Spend (Budgeting, Paying bills). School subjects: CTE (Career and technical education), Math, Social studies or history.