Solution - Long subtraction
4.15
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths |
| 8 | . | 0 | 4 | |
| - | 3 | . | 8 | 9 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (4) in the hundredths column is too small to get a positive difference, borrow 1 from the number to the left (8.0) which becomes (7.9) and get (14).
| Place value | ones | . | tenths | hundredths |
| 7 | 9 | 14 | ||
| 8 | . | 0 | 4 | |
| - | 3 | . | 8 | 9 |
| . |
Subtract the numbers in the hundredths column from the top number:
14-9=5
| Place value | ones | . | tenths | hundredths |
| 7 | 9 | 14 | ||
| 8 | . | 0 | 4 | |
| - | 3 | . | 8 | 9 |
| . | 5 |
Subtract the numbers in the tenths column from the top number:
9-8=1
| Place value | ones | . | tenths | hundredths |
| 7 | 9 | 14 | ||
| 8 | . | 0 | 4 | |
| - | 3 | . | 8 | 9 |
| . | 1 | 5 |
Subtract the numbers in the ones column from the top number:
7-3=4
| Place value | ones | . | tenths | hundredths |
| 7 | 9 | 14 | ||
| 8 | . | 0 | 4 | |
| - | 3 | . | 8 | 9 |
| 4 | . | 1 | 5 |
The solution is: 4.15
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