Add 10.82 + (-15.96).

-5.14

It was 13*C yesterday, but the temperature changed by -18.6* overnight. What is the temperature now?

-5.6°C

To add 10.82 and -15.96, follow these steps:

Step 1: Write down the numbers you need to add: 10.82 and -15.96.

Step 2: Align the numbers vertically, placing the decimal points in the same column:
10.82
+ (-15.96)

Step 3: Add the numbers in the ones column (rightmost column): 2 + 6 = 8.

Step 4: Move to the next column (tenths column): 8 + 9 = 17.

Step 5: Write down the 7 in the tenths column and carry-over the 1 to the next column.

Step 6: Move to the next column (hundredths column): 1 + 1 + 5 = 7.

Step 7: Write down the 7 in the hundredths column.

Step 8: The final result is 10.82 + (-15.96) = -5.14.

To add 10.82 and (-15.96), you can follow these steps:

Step 1: Write down the two numbers vertically:

```
10.82
+(-15.96)
```

Step 2: Add the numbers column by column, starting from the right:

```
10.82
+(-15.96)
_______
```

Begin by adding the hundredths place: 2 + 6 equals 8.

```
10.82
+(-15.96)
_______
.08
```

Step 3: Moving to the tenths place, there is nothing to add in this case.

```
10.82
+(-15.96)
_______
.08
```

Step 4: Next, add the ones place: 1 + (-9) equals -8.

```
10.82
+(-15.96)
_______
-8.08
```

Step 5: Finally, add the tens place: 0 + (-5) equals -5.

```
10.82
+(-15.96)
_______
-5.14
```

Therefore, 10.82 + (-15.96) equals -5.14.