How to Do Plus and Minus on a Mac

Check to see if you have the ± symbol on your Mac keyboard. Some Macbooks released in 2009 or later have the symbol on the keyboard above the 'TAB' key. Press 'Shift'+'§' to produce the '±' symbol. If you do not have this key, you can use the universal method.
Hold 'Shift' and then hold 'ALT' (Option).
Press the equals sign (=) key. The three-key combination will insert the ± symbol.
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