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Select the cell(s).
Choose the CELLS option from the Format menu.
Select the option NUMBER.
Or click on the arrow sign at the right-bottom corner of the Number option of the Home tab.
Select desired formats.
Click on OK.
Select the cell(s).
Select the option CLEAR from the Edit menu and then select the option Formats.
Or click on the clear icon at the left-bottom of the Editing option of the Home tab and select Clear Formats.