Format → Merge cells → Merge and center cells

Merge cells → Merge and centre cells → Merge cells

Format → Merge cells → Merge and centre cells

Edit → Merge cells → Merge and center cells

Select the row → Edit menu → Delete cells.

Select the row → Format menu → Delete cells 

Select the row → File menu → Delete cells

Select the row → Insert menu → Delete cells

Applications → Accessories → OpenOffice.org Calc

Accessories → Applications → OpenOffice.org Calc

OpenOffice.org. Calc

Applications → Office → OpenOffice.org Calc

To find the sum total

To find out average

To find out product

To find out difference