- 1). Open the Open Office program.
- 2). Click "Spreadsheet" to open a new spreadsheet, or click "File" and then "Open" to open an existing spreadsheet.
- 3). Navigate to the cell where the calculation is to be performed.
- 4). Enter the calculation by typing an equals sign, followed by the mathematical formula. For example, to add a column range and have the results display in the cell, type "=sum(A1:A10)" without quotes, then press the "Enter" key. This displays the sum of cells A1 through A10 in the cell which the formula was typed.
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