function used to reduce a given value to a specific number of decimal places
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Round a number to the decimal places I want
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If you don’t want unnecessary decimal places in cells because they cause ###### symbols to appear, or you don’t need accuracy down to the microscopic level, change the cell format to get the number of decimal places you want.
Or if you want to round to the nearest major unit, such as thousands, hundreds, tens, or ones, use a function in a formula.
By using a button:
Select the cells that you want to format.
On the Home tab, click Increase Decimal or Decrease Decimal to show more or fewer digits after the decimal point.
By applying a built-in number format:
On the Home tab, in the Number group, click the arrow next to the list of number formats, and then click More Number Formats.