Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
4-3=1
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 1 |
Subtract the numbers in the tens column from the top number:
9-0=9
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 9 | 1 |
Subtract the numbers in the hundreds column from the top number:
7-4=3
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 3 | 9 | 1 |
Subtract the numbers in the thousands column from the top number:
7-7=0
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 0 | 3 | 9 | 1 |
Because the upper digit (7) in the ten thousands 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 (17).
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 17 | ||||||
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 0 | 3 | 9 | 1 |
Subtract the numbers in the ten thousands column from the top number:
17-8=9
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 17 | ||||||
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 9 | 0 | 3 | 9 | 1 |
Because the upper digit (7) in the hundred thousands column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (17).
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 6 | 17 | ||||||
| 7 | 17 | ||||||
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 9 | 0 | 3 | 9 | 1 |
Subtract the numbers in the hundred thousands column from the top number:
17-9=8
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 6 | 17 | ||||||
| 7 | 17 | ||||||
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 8 | 9 | 0 | 3 | 9 | 1 |
Write 6 in the millions place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 6 | 17 | ||||||
| 7 | 17 | ||||||
| 7 | 8 | 7 | 7 | 7 | 9 | 4 | |
| - | 9 | 8 | 7 | 4 | 0 | 3 | |
| 6 | 8 | 9 | 0 | 3 | 9 | 1 |
The solution is: 6,890,391
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