**± How to Type Plus or Minus Symbol on Keyboard (+- in Word …**
https://howtotypeanything.com/plus-minus-symbol/

To type the Plus or Minus Symbol on Mac, press Option + Shift + = shortcut on your keyboard. For Windows users, simply press down the Alt key and type 0177 using the numeric keypad, then let go of the Alt key. These Plus or Minus sign shortcuts can work on any software including MS Word, Excel, and PowerPoint, on both Windows and Mac.

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