Select the cells you want to change
Go to the Home tab
In the Number group, click Decrease Decimal until the decimals are removed
Or right-click the selected cells and choose Format Cells
Select Number
Set Decimal places to 0
Click OK
Or use the shortcut Ctrl+1 to open Format Cells
Select Number
Set Decimal places to 0
Click OK
Or use the ROUND function in a formula, such as =ROUND(A1,0)
Or use INT or TRUNC if you want to remove decimals from the value in a formula