How do you subtract one decimal from another?

To subtract one decimal from another, align the decimal points and subtract as you would with whole numbers.

When subtracting decimals, the first step is to write the numbers vertically, ensuring that the decimal points are directly aligned. This alignment is crucial because it ensures that each digit is in the correct place value column (units, tenths, hundredths, etc.). If the numbers have different lengths, you can add zeroes to the end of the shorter number to make them the same length, which helps to avoid confusion.

For example, if you are subtracting 3.75 from 8.4, you would write it as:

```
8.40
- 3.75
```

Next, subtract each column starting from the rightmost digit, just as you would with whole numbers. If a column in the top number is smaller than the corresponding column in the bottom number, you will need to borrow from the next column to the left. In our example:

```
8.40
- 3.75
```

Starting from the rightmost column (hundredths), 0 is less than 5, so you borrow 1 from the tenths column, making it 10 - 5 = 5. Now, the tenths column is 3 (since you borrowed 1), and 3 - 7 requires borrowing again from the units column. This makes it 13 - 7 = 6. Finally, subtract the units column: 7 - 3 = 4. So, the result is:

```
4.65
```

By following these steps, you can accurately subtract any two decimal numbers.