Solution - Long subtraction
109
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 1 | 3 | 3 | |
| 7 | |||
| - | 1 | 7 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (3) in the ones column is too small to get a positive difference, borrow 2 from the digit (3) in the next number place which becomes (1) and get (23).
| Place value | hundreds | tens | ones |
| 1 | 23 | ||
| 1 | 3 | 3 | |
| 7 | |||
| - | 1 | 7 | |
Subtract the numbers in the ones column from the top number:
23-7-7=9
| Place value | hundreds | tens | ones |
| 1 | 23 | ||
| 1 | 3 | 3 | |
| 7 | |||
| - | 1 | 7 | |
| 9 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | hundreds | tens | ones |
| 1 | 23 | ||
| 1 | 3 | 3 | |
| 7 | |||
| - | 1 | 7 | |
| 0 | 9 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones |
| 1 | 23 | ||
| 1 | 3 | 3 | |
| 7 | |||
| - | 1 | 7 | |
| 1 | 0 | 9 |
The solution is: 109
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