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 |
9 | 8 | 1 | |
- | 8 | 7 | 2 |
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 1 from the digit (8) in the next number place which becomes (7) and get (11).
Place value | hundreds | tens | ones |
7 | 11 | ||
9 | 8 | 1 | |
- | 8 | 7 | 2 |
Subtract the numbers in the ones column from the top number:
11-2=9
Place value | hundreds | tens | ones |
7 | 11 | ||
9 | 8 | 1 | |
- | 8 | 7 | 2 |
9 |
Subtract the numbers in the tens column from the top number:
7-7=0
Place value | hundreds | tens | ones |
7 | 11 | ||
9 | 8 | 1 | |
- | 8 | 7 | 2 |
0 | 9 |
Subtract the numbers in the hundreds column from the top number:
9-8=1
Place value | hundreds | tens | ones |
7 | 11 | ||
9 | 8 | 1 | |
- | 8 | 7 | 2 |
1 | 0 | 9 |
The solution is: 109
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