By default, Excel creates three worksheets in each new workbook that you create. If you prefer to reduce or increase this behavior to better meet your needs, follow these instructions…
1. Click the Office Button.
2. Click the Excel Options button.
3. Select Popular from the left pane.
4. Under the When creating new workbooks section, change the value for Include this many sheets to the number of worksheets you want made to all new workbooks.
5. Click OK.