Excel Convert Negative to Positive: Data Manipulation

How To Convert Negative Values To Positive In Excel

Write -1 in a blank cell, copy it and then select the negative numbers.

Note: If a negative number are not adjacent, select the first negative number and then hold Ctrl key, and select the other negative numbers.

After you have selected all the negative number, right click, a drop down menu will appear from which you have to select “Paste Special”.

A new drop down menu will appear. Select “Paste Special” option at the bottom of the drop down menu then select “Multiply” option from the operation. Click ok.

All the negative number selected are now positive.

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Further reading: 
Basic concepts 
Getting started with Excel
Cell References