|One of the main features of spreadsheet software is that it performs calculations. These calculations are based on formulas you've entered or on built-in formulas called functions.|4000|4200|1590|3075||0|0|0|0|
|When this worksheet was created, the formula =B4-B5 was entered into cell B6. This formula tells the worksheet to subtract the contents of cell B5 from the contents of cell B4.|4000|4200|1590|3075||0|0|1|0|
|When you press the Enter key to enter the formula, the result of the calculation appears in the cell. The formula remains behind the scenes.|4015|4200|1440|2865||0|0|1|0|
|A generic formula containing cell references automatically updates the results shown for income even if you change the data for income or expenses.|3855|3420|1275|2985||0|0|0|0|
|You can change the numbers in your worksheet as often as necessary and the calculations will automatically update. This feature makes spreadsheet software a powerful and flexible number crunching tool.|5460|3720|1860|3015||0|0|0|0|