In Excel how would I replace a specific number everytime it appears in a column?

I have an excel file that contains a column with various numbers. The number "100" appears many times.
I need to replace "100" every time it appears in this column with "-1"
All other numbers must remain as is. I have attached an example.example-EE.xlsx
Please advise.Thank you
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Katie PierceCommented:
There is perhaps a macro you can run to accomplish such a task, but unfortunately I can't be of any help there. For a more manual option, you can run a helper column that gives you the results you're looking for.

So, if your data were in column A, then in column B you could have:

Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
depends on when and where you want to replace the text. If you do not want to create another column and wish to replace for the original values, you can try use this macro scripts accordingly:
Sub test()
    Range("B:B").Replace "100", "-1"
End Sub

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
in case you need to do it dynamically and instantly, you can also create a sub like this in target worksheet's Change event:
Private Sub Worksheet_Change(ByVal Target As Range)
    If Target.Column = 2 Then
        For Each r In Target
            r.Replace "100", "-1"
    End If
End Sub

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
ooops, sorry, which it can be simplified as:
Private Sub Worksheet_Change(ByVal Target As Range)
'The column you wish to replace with... 2 = Column B, etc
    If Target.Column = 2 Then
        Target.Replace "100", "-1"
    End If
End Sub

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Saurabh Singh TeotiaCommented:
In C Column you can simply use this formula...


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Enclosed your workbook for reference...

BiopsychAuthor Commented:
Ryan Chong:

Thank you very much. Perfect answer. Very helpful.
BiopsychAuthor Commented:
Thanks for all your solutions.  I did not want to create a new column. I needed to replace the "100"s with "-1" in the same column.
 Sorry that my post was not as clear as I had thought.
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Microsoft Excel

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