Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
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 | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
Subtract the numbers in the ones column from the top number:
11-4=7
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 7 |
Subtract the numbers in the tens column from the top number:
7-3=4
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 4 | 7 |
Because the upper digit (8) in the hundreds column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (18).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 4 | 7 |
Subtract the numbers in the hundreds column from the top number:
18-9=9
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 9 | 4 | 7 |
Because the upper digit (2) in the thousands column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (12).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 12 | |||||
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 9 | 4 | 7 |
Subtract the numbers in the thousands column from the top number:
12-9=3
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 12 | |||||
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 3 | 9 | 4 | 7 |
Because the upper digit (0) in the ten thousands column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (10).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 10 | |||||
| 0 | 12 | |||||
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 3 | 9 | 4 | 7 |
Subtract the numbers in the ten thousands column from the top number:
10-7=3
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 10 | |||||
| 0 | 12 | |||||
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 3 | 3 | 9 | 4 | 7 |
Write 0 in the hundred thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 10 | |||||
| 0 | 12 | |||||
| 2 | 18 | |||||
| 7 | 11 | |||||
| 1 | 1 | 3 | 8 | 8 | 1 | |
| - | 7 | 9 | 9 | 3 | 4 | |
| 0 | 3 | 3 | 9 | 4 | 7 |
The solution is: 33,947
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