The most important step when subtracting decimal numbers is to line up the decimal points.
Then, the difference of decimal numbers with more than one digit can be found by subtracting each column from right to left, starting with the smallest decimal place.
Subtract the columns from right to left. Remember to regroup when the top number in a column is less than the bottom number.
| | 4 | 4 | 7 | .6 | 1 |
| - | | 1 | 7 | 2 | .4 | 6 |
| |
2 | 7 | 5 | .1 | 5 |