How to add Plus and minus symbol in Microsoft word ( Special symbol + _ how to write in microsoft word)

If we have to write 45 plus minus 3 , we have to use + symbol with - below it. I was searching for it and came across two ways to make it:

1) Microsoft word-> Insert-> Symbol -> Select "±"

2) Another way Write +, select it and underline it using ctrl+u like this ->+

Both ways are proper but second way has more clarity and both symbols are not joined so looks better..

eg. 56 ± 5

     56 + 5

You decide which one you want to use.