Solution - Long subtraction
30,721,150
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
6-6=0
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 0 |
Because the upper digit (3) in the tens column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (13).
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 0 |
Subtract the numbers in the tens column from the top number:
13-8=5
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 5 | 0 |
Subtract the numbers in the hundreds column from the top number:
4-3=1
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 1 | 5 | 0 |
Write 1 in the thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 1 | 1 | 5 | 0 |
Write 2 in the ten thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 2 | 1 | 1 | 5 | 0 |
Write 7 in the hundred thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 7 | 2 | 1 | 1 | 5 | 0 |
Write 0 in the millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 0 | 7 | 2 | 1 | 1 | 5 | 0 |
Write 3 in the ten millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 13 | |||||||
| 3 | 0 | 7 | 2 | 1 | 5 | 3 | 6 | |
| - | 3 | 8 | 6 | |||||
| 3 | 0 | 7 | 2 | 1 | 1 | 5 | 0 |
The solution is: 30,721,150
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