Soluzione - Long subtraction
312.851
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 |
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
2-1=1
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 1 |
Because the upper digit (0) in the tens column is too small to get a positive difference, borrow 1 from the number to the left (90) which becomes (89) and get (10).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 10 | ||||
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 1 |
Subtract the numbers in the tens column from the top number:
10-5=5
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 10 | ||||
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 5 | 1 |
Subtract the numbers in the hundreds column from the top number:
9-1=8
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 10 | ||||
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 8 | 5 | 1 |
Subtract the numbers in the thousands column from the top number:
8-6=2
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 10 | ||||
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 2 | 8 | 5 | 1 |
Subtract the numbers in the ten thousands column from the top number:
8-7=1
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 10 | ||||
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 1 | 2 | 8 | 5 | 1 |
Write 3 in the hundred thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 10 | ||||
| 3 | 8 | 9 | 0 | 0 | 2 | |
| - | 7 | 6 | 1 | 5 | 1 | |
| 3 | 1 | 2 | 8 | 5 | 1 |
The solution is: 312,851
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