Working with the Comma Style in Excel 2007

The Comma Style format (also known as the thousands separator) in Excel 2007 often accompanies the Accounting number format. Like the Accounting format, the Comma format inserts commas in larger numbers to separate thousands, hundred thousands, millions, and . . . well, you get the idea.

The Comma Style format also displays two decimal places and puts negative values in parentheses. What it doesn’t display is dollar signs. This makes it perfect for formatting tables where it’s obvious that you’re dealing with currency or for larger values that have nothing to do with money.

Use the Comma Style format in a large table of financial data in which you only want to display the currency symbols with the totals for the columns or rows. All remaining (detail) data can be formatted with the Comma Style, and the decimal points will line up with the totals that use the Accounting format. The gap on the right between the last digit and the cell border accommodates the right parenthesis in negative values, ensuring that they, too, align precisely on the decimal point.

Monthly sales figures after formatting their cells with the Comma Style number format.
Monthly sales figures after formatting their cells with the Comma Style number format.

To format numbers in Excel 2007 with the Comma style, follow these steps:

  1. Select the cells containing the numbers you want to format.

  2. From the Home tab, click the Number dialog box launcher in the bottom-right corner of the Number group.

    The Format Cells dialog box appears, with the Number tab on top.

  3. In the Category list, select Number.

  4. Select the Use 1000 Separator (,) check box.

  5. Click OK.

Click the Comma Style button (with the comma icon) in the Number group of the Home tab to quickly format the cell selection by displaying the thousands separator.

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