You can change the number that appears on the first slide in PowerPoint by adjusting the starting slide number. Here's how:
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Go to the Design Tab: In PowerPoint, click on the "Design" tab in the ribbon at the top of the screen.
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Access Slide Size Options: In the "Customize" group on the right side of the Design tab, click on "Slide Size."
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Choose Custom Slide Size: From the dropdown menu, select "Custom Slide Size..." This opens the Slide Size dialog box.
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Set the Starting Slide Number: In the "Slide Size" dialog box, locate the "Number slides from" box. This box determines what number will appear on your first slide. Enter the desired number in this box (e.g., enter "0" if you want the first slide to be numbered as "0", or "1" to start at "1").
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Confirm the Change: Click "OK" to save your changes. The slide numbers in your presentation will now reflect the new starting number.
In Summary: To change the number on the first slide, you adjust the "Number slides from" setting in the Custom Slide Size options under the Design tab. This allows you to specify the starting slide number for your entire presentation.