Solution - Long subtraction
40.8
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 6 | 8 | . | 9 | |
| - | 2 | 8 | . | 1 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
9-1=8
| Place value | tens | ones | . | tenths |
| 6 | 8 | . | 9 | |
| - | 2 | 8 | . | 1 |
| . | 8 |
Subtract the numbers in the ones column from the top number:
8-8=0
| Place value | tens | ones | . | tenths |
| 6 | 8 | . | 9 | |
| - | 2 | 8 | . | 1 |
| 0 | . | 8 |
Subtract the numbers in the tens column from the top number:
6-2=4
| Place value | tens | ones | . | tenths |
| 6 | 8 | . | 9 | |
| - | 2 | 8 | . | 1 |
| 4 | 0 | . | 8 |
The solution is: 40.8
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