Use long division to convert 3 4/5 to a decimal.

To convert 3 4/5 to a decimal using long division, you can approach it as follows:

First, write down the mixed number as a fraction: 3 4/5 = (3 * 5 + 4) / 5 = 19/5.

Now, we can perform the long division:

```
3.8
---------
5 | 19.0
15
---
40
40
---
0
```

Therefore, the decimal representation of 3 4/5 is 3.8.

To convert 3 4/5 to a decimal using long division, follow these steps:

Step 1: Write the mixed number as an improper fraction.
3 4/5 = (3 × 5 + 4) / 5 = 19/5

Step 2: Perform long division by dividing the numerator (19) by the denominator (5).

3.8
_______
5 | 19
- 15
----
4

Step 3: Continue the long division process until you reach your desired level of accuracy. In this case, since the denominator is 5, you can stop after one decimal place.

Therefore, converting 3 4/5 to a decimal using long division yields 3.8.