If you want to insert numbers into your excel page you need to first select file.
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Click page setup.
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Then click the header/footer tab.

If you want the page number in the header click customize header, if you want the page number in the footer click customize footer.
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You can choose to place it left, right or center.
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Click the page number button so you see &[page] in the space you selected.
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Click ok. You’ve now inserted a page number into your excel spreadsheet
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