Solution - Long subtraction
686
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 7 | 1 | 1 | |
| 1 | 8 | ||
| - | 7 | ||
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 2 from the number to the left (71) which becomes (69) and get (21).
| Place value | hundreds | tens | ones |
| 6 | 9 | 21 | |
| 7 | 1 | 1 | |
| 1 | 8 | ||
| - | 7 | ||
Subtract the numbers in the ones column from the top number:
21-8-7=6
| Place value | hundreds | tens | ones |
| 6 | 9 | 21 | |
| 7 | 1 | 1 | |
| 1 | 8 | ||
| - | 7 | ||
| 6 |
Subtract the numbers in the tens column from the top number:
9-1=8
| Place value | hundreds | tens | ones |
| 6 | 9 | 21 | |
| 7 | 1 | 1 | |
| 1 | 8 | ||
| - | 7 | ||
| 8 | 6 |
Write 6 in the hundreds place.
| Place value | hundreds | tens | ones |
| 6 | 9 | 21 | |
| 7 | 1 | 1 | |
| 1 | 8 | ||
| - | 7 | ||
| 6 | 8 | 6 |
The solution is: 686
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