How to Use SUM Function Formula Using in Excel SUM function Formula in Excel The SUM function Formula is one of the Most Useful function, Syntax: SUM(number1,[number2],...) For example 1: Adding + Count A B C (Result) 2111 25447 27558 Adds the value in cells A1 and B1 . The result is 27558 Formula : =SUM(A1+B1) =SUM(A1:B1) For example 2: Deducting - Count A B C (Result) 25447 2111 23336 Adds the value in cells A1 and B1 . The...