How to Create SUM Function

Syntax

=SUM(number1,number2, ...)

Number1, number2, ... are 1 to 30 arguments for which you want the total value or sum.

Example

=SUM(3,4,7,8,2,5)

Adds 3,4,7,8,2,5 and 2 (result=29)

=SUM(C4:C9)

Adds number in cell C4 until cell C9 (result=29)