Solution - Long subtraction
99
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 1 | 0 | 3 | |
| - | 4 | ||
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 1 from the number to the left (10) which becomes (09) and get (13).
| Place value | hundreds | tens | ones |
| 0 | 9 | 13 | |
| 1 | 0 | 3 | |
| - | 4 | ||
Subtract the numbers in the ones column from the top number:
13-4=9
| Place value | hundreds | tens | ones |
| 0 | 9 | 13 | |
| 1 | 0 | 3 | |
| - | 4 | ||
| 9 |
Write 9 in the tens place.
| Place value | hundreds | tens | ones |
| 0 | 9 | 13 | |
| 1 | 0 | 3 | |
| - | 4 | ||
| 9 | 9 |
Write 0 in the hundreds place.
| Place value | hundreds | tens | ones |
| 0 | 9 | 13 | |
| 1 | 0 | 3 | |
| - | 4 | ||
| 0 | 9 | 9 |
The solution is: 99
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