You can insert a calculation directly into a text document or into a text table.
Click in the document where you want to insert the calculation, and then press F2. If you are in a table cell, type an equals sign =.
Type the calculation that you want to insert, for example, "=10000/12", and then press Enter.
You can also click the \
To reference cells in a Writer text table, enclose the cell address or the cell range in angle brackets. For example, to reference cell A1 from another cell, enter =
To make a table cell entry that starts with = sign, first enter a space, then the = sign, and then delete the space.