Decimal subtraction is the process of taking one decimal number away from another. To perform decimal subtraction, align the numbers by their decimal points and subtract each digit starting from the rightmost side. If a digit in the top number is smaller than the corresponding digit in the bottom number, you may need to borrow from the next left digit. For example, when subtracting 3.5 from 7.2, you align the numbers as follows: ``` 7.2 - 3.5 ``` Subtracting gives you 3.7. Decimal subtraction is similar to whole number subtraction but requires careful attention to the decimal point.