Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
0-0=0
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 |
Subtract the numbers in the tens column from the top number:
0-0=0
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 |
Subtract the numbers in the hundreds column from the top number:
0-0=0
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 | 0 |
Subtract the numbers in the thousands column from the top number:
0-0=0
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 | 0 | 0 |
Subtract the numbers in the ten thousands column from the top number:
0-0=0
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 | 0 | 0 | 0 |
Subtract the numbers in the hundred thousands column from the top number:
0-0=0
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 | 0 | 0 | 0 | 0 |
Because the upper digit (0) in the millions column is too small to get a positive difference, borrow 1 from the number to the left (50) which becomes (49) and get (10).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 9 | 10 | ||||||||
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 | 0 | 0 | 0 | 0 |
Subtract the numbers in the millions column from the top number:
10-1=9
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 9 | 10 | ||||||||
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 9 | 0 | 0 | 0 | 0 | 0 | 0 |
Subtract the numbers in the ten millions column from the top number:
9-2=7
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 9 | 10 | ||||||||
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 7 | 9 | 0 | 0 | 0 | 0 | 0 | 0 |
Write 4 in the hundred millions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 9 | 10 | ||||||||
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 4 | 7 | 9 | 0 | 0 | 0 | 0 | 0 | 0 |
Write 4 in the billions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 9 | 10 | ||||||||
| 4 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 4 | 4 | 7 | 9 | 0 | 0 | 0 | 0 | 0 | 0 |
The solution is: 4,479,000,000
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