Answer :

Final answer:

To find the sum of -356.1 + 258.6, line up the decimals, add the digits in each column, and carry when necessary. The sum is -974.7.


Explanation:

To find the sum of -356.1 + 258.6, first line up the decimal points. Then add the digits in each column, carrying any necessary digits to the left. Starting from the rightmost column, we have:

- 3 5 6 .
+ 2 5 8 . 6
-----------------
-
Since the decimal point is aligned, we can add the digits:

- 3 5 6 .
+ 2 5 8 . 6
-----------------
- 9 7 4 . 7

Therefore, the sum of -356.1 + 258.6 is -974.7.


Learn more about Adding and Subtracting Decimals