LibreOfficeDev 7.4 Help
SUM(Number 1 [; Number 2 [; … [; Number 255]]])
=SUM(2;3;4) returns 9.
=SUM(A1;A3;B5) calculates the sum of the three cells.
=SUM(A1:E10) calculates the sum of all cells in the A1 to E10 cell range.
A formula such as =SUM((A1:A40>=C1)*(A1:A40
Refer to the SUM wiki page for more details about this function.