# Creating Simple Formulas

When using formulas in Excel you can add, subtract, multiply, and divide. Use simple Excel formulas to also make cell references in Excel.

### Challenge!

- Open an
**existing Excel 2010 workbook**. If you want, you can use this example. - Write a simple
**division formula**. If you are using the example, write the formula in cell **B18** to calculate the painting cost per square foot. - Write a simple
**addition formula** using cell references. If you are using the example, write the formula in cell **F5** to calculate the total budget. - Write a simple
**subtraction formula** using the point-and-click method. If you are using the example, subtract the **Expand Bathroom** cost (C6) from the **Total** cost (C11). Calculate your answer in C12. - Edit a formula using the
**formula bar**.