MS Power Point
To give a PowerPoint presentation to a large audience, you:

Click the slide you wish the audience to see in normal view, then click the next slide, and so on
Choose either view, slide show or slide show, view show
Slick slide show, OK
Set up your computer in a large auditorium, and click large, auditorium, OK

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MS Power Point
To insert slide numbers

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

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