SUM 
SUM(number1 [,number2] [..]) 
Returns the total of the values in a list, range or array. 
number1  The first number. 
number2  (Optional) The second number. 
REMARKS 
* For an illustrated example refer to the page under Advanced Functions * This function includes hidden cells. * Arguments that are just numbers are included. * Arguments that are just numbers passed as text ("3") are included. See Example 15. * Arguments that are just logical values are included. True evaluates to 1. False evaluates to 0. See Example 18. * Arguments that are just text will generate a #VALUE! error. See Example 16. * Arguments that are references to empty cells are excluded. See Example 8. * Arguments that are references to cells containing zeros are included. See Example 9. * Arguments that are references to cells containing dates are included and the date serial number is used. See Example 12. * Arguments that are references to cells containing logical values are excluded. See Example 11. * Arguments that are references to cells containing text are excluded. See Example 10. * Arguments that are arrays containing logical values are excluded. See Example 20. * Arguments that are arrays containing text are excluded. See Example 17. * If any cell references contain an error, then that error is returned. See Example 14. * You can have a maximum of 255 arguments. * To sum all the values in column "C" use: "=SUM(C:C)". This function automatically finds the last used row in a column reference. * There is also an AutoSum button to help you enter this function quickly. * You can use the SUMIFS function to satisfy multiple conditions. * You can use the SUMPRODUCT function to return the sum of the product of one or more arrays of values. * You can use the SUMSQ function to return the sum of the squares of all the values in a list, table or cell range. * You can use the AGGREGATE function to exclude hidden cells. * You can use the SUMFORMAT to return the sum of all the values that have been formatted with multiple attributes. * You can use the SUMVISIBLE  User Defined Function to exclude hidden cells. * This is similar to the AVERAGE, COUNT, MAX and MIN functions. * For the Microsoft documentation refer to support.microsoft.com * For the Google documentation refer to support.google.com 

1  What is the sum of 2 and 4. 2  What is the sum of 5, 10 and 15. 3  What is the sum of 5, 10, 15 and 0. Zeros are always included. 4  What is the sum of 2, 3, 4, 5 and 6. 5  What is the sum of the values in the array (2, 3, 4, 5, 6). 6  What is the sum of the values in range "B1:B3". 7  What is the sum of the values in range "B1", "B2" and "B3". 8  What is the sum of the values in range "B1", "B2", "B3" and "B4". B4 is empty. Empty cells are always excluded. 9  What is the sum of the values in range "B1", "B2", "B3" and "B5". B5 is zero so this gets included. 10  What is the sum of the values in range "B1", "B2", "B3" and "B6". B6 is text so this gets excluded. 11  What is the sum of the values in range "B1", "B2", "B3" and "B7". B7 is a logical value so this gets excluded. 12  What is the sum of the values in range "B1", "B2", "B3" and "B8". B8 is a date so this gets included as a date serial number. 13  What is the sum of the values in the named range that refers to the range "B1:B3". 14  What is the sum of the values in range "B5", "B6" and "B9". B9 contains an error so that gets returned. 15  What is the sum of 2 and "2". Text values that are actually numbers are included. 16  What is the sum of 2 and "some text". Text values passed as arguments are excluded. 17  What is the sum of the values in the array (2, "some text"). Text values inside arrays are excluded. 18  What is the sum of 2 and TRUE. Logical values passed as arguments are included. 19  What is the sum of 2 and FALSE. Logical values passed as arguments are excluded. 20  What is the sum of the values in the array (2, TRUE). Logical values inside arrays are excluded. 
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