MS Power Point
To insert slide numbers

Insert a new text box and select Insert >> slide Number
Insert a textbox and select Insert >> Number >> PageNumber
Insert a text box and select Insert >> Page Number
Choose Insert >> Slide Number

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MS Power Point
How to change the order of Slides in Presentation?

On Slide Sorter View, click on the Soft Slides
On Slide Sorter View, click on the slide and drag to required position
On Slide Thumbnail view, click on the slide and drag to required position
Slides order cannot be changed once it created

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