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Undo last action

Windows shortcut 
CtrlZ
Mac shortcut 
Z

This shortcut will allow multiple levels of undo; each time you use it Excel will step back one level.

Related videos

The videos below demonstrate this shortcut.
In this video, we show you how keep a chart up to date with new data, and how to add new data to an existing chart.
In this video, we'll look at how to use the SUMIF function to sum cells that meet a single criteria in a set of data.
In this video, we'll look at how to replace what you've found. Find and replace is a powerful tool when making global changes to worksheets.
It can sometimes be difficult to know what is causing formula errors. In this video, we'll look at how to track down the source of a formula error in Excel.
In this video, we'll look at how to create a dynamic reference to a named range with the INDIRECT function. This is one way to switch ranges on the fly.