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Insert columns

Windows shortcut 
CtrlShift+
Mac shortcut 
I

This shortcut will insert columns as long as at least one column is selected.

Note: In Mac 2016, this shortcut was changed to Control Shift + (same as Windows).

Related videos

Tip:  Shortcuts for Excel Tables
Excel has great support for shortcuts in tables. Shortcuts for inserting, selecting, and deleting rows and columns all work much better! Watch the video to see how.