Theory:

worksheet is an area where you do all the tasks. You can enter and edit data in a worksheet. A combination of one or more worksheets forms a workbook.
 
Opening a Worksheet:

To open a worksheet that has been saved,
  • Click the LibreOffice Calc Spreadsheet from the LibreOffice Start Centre.
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  • By default, you always get a workbook (sheet \(1\)) when you open the LibreOffice Calc application.
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  • Select the Open option from the file menu.
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  • A dialog box with a list of files will appear on the screen.
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  • Select the file that you want by clicking on it and then click on Open.
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  • You can also click the Open icon on the Standard toolbar to open an existing file.
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Closing the worksheet:

In order to close the worksheet,
  • Go to the File menu and select the Close option.
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