Excel opens with three blank worksheets. The total number of worksheets you can include in Excel 2007 and higher is limited by the amount of computer memory available to Excel.
Worksheets are stored in a workbook in Excel.
The typical number of worksheets for a "New file..." in Microsoft Excel has always been 3.
As many as you like.
In general, a new workbook in Microsoft Excel starts with three (3) worksheets. The number of worksheets that are created by default may be changed using the Microsoft Excel options.
In Microsoft Excel, a new workbook will normally have three worksheets.
The default new worksheet opens with three worksheets, but can add as many sheets as you need.