Solution - Long subtraction
80
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 8 | 5 | |
| 1 | ||
| - | 4 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
5-1-4=0
| Place value | tens | ones |
| 8 | 5 | |
| 1 | ||
| - | 4 | |
| 0 |
Write 8 in the tens place.
| Place value | tens | ones |
| 8 | 5 | |
| 1 | ||
| - | 4 | |
| 8 | 0 |
The solution is: 80
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