1, create a new word to open and dial the number 90;

2. Click Insert again;

3, then click on the symbol/other symbols;

4. In the symbol window that pops up, select "(plain text)" as the font and "Latin-1 supplement" as the subset;

5. Then you can see the degree symbol below -0, and click Insert/Cancel;

6. Click Cancel to close the symbol window and enter 90, as shown below.