Line them both underneath each other like:
-59
-82
Then you add 9 by 2 then you add 5 by 8 and add the top number to the left one. After you find the answer, you find out how many places there are after the decimal to both of them. You will find out that there are two places. So on our answer we will move the decimal to the left twice and then you have your answer.
\(-5.9+-8.2\\ = -5.9-8.2\\ = - (5.9 + 8.2)\\ = -14.1\)
That's a question that our calculator can do :D but I do it all by myself.
Line them both underneath each other like:
-59
-82
Then you add 9 by 2 then you add 5 by 8 and add the top number to the left one. After you find the answer, you find out how many places there are after the decimal to both of them. You will find out that there are two places. So on our answer we will move the decimal to the left twice and then you have your answer.