Once you've created a working formula, don't waste time typing and retyping it. Simply fill it to the other cells. To do this, you will need to recognize the mouse pointer's various shapes. When you move the mouse pointer around the Excel window, it changes shape and function.
If you'll be copying a formula to a surrounding cell, you can use the Fill method. The square box in the lower-right corner of the cell pointer is the fill handle.
In Excel, the references change as the formula is copied. Remember, you use references to identify cells containing the numbers you want to calculate in a formula.
You can also use copy and paste to copy a formula to other cells. This will be discussed on the next page.