Math Monday: Budgeting with Spreadsheets - Blog This Math Monday, learn how to build a budget spreadsheet with the Financial Algebra lesson FA-4.4 Budgeting Tools. This lesson is a part of the Budgeting & Systems of Inequalities Unit, but it could also be a great way to teach a real-world skill when you have a day or two to fill in between units or days off. The Lesson Students overview the budgeting apps they could use, practice writing ...