Sharepoint Calculated Columns

DBreezy92 To add numbers in two or more columns in a row, use the addition operator (+) or the SUM function.

Examples: 

=[Column1]+[Column2]+[Column3]

OR

=SUM([Column1],[Column2],[Column3])

To subtract numbers in two or more columns in a row, use the subtraction operator (-) or the SUM function with negative numbers.

=[Column1]-[Column2]

OR

=SUM([Column1], [Column2], [Column3])

For more information, check this documentation:  Calculated Field Formulas - Mathematical formulas 

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