Solution - Long subtraction
Step-by-step explanation
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 |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (10).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 9 |
Subtract the numbers in the tens column from the top number:
8-2=6
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 6 | 9 |
Subtract the numbers in the hundreds column from the top number:
8-3=5
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 5 | 6 | 9 |
Subtract the numbers in the thousands column from the top number:
7-4=3
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 3 | 5 | 6 | 9 |
Subtract the numbers in the ten thousands column from the top number:
6-5=1
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 1 | 3 | 5 | 6 | 9 |
Because the upper digit (5) in the hundred thousands column is too small to get a positive difference, borrow 1 from the digit (4) in the next number place which becomes (3) and get (15).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 1 | 3 | 5 | 6 | 9 |
Subtract the numbers in the hundred thousands column from the top number:
15-6=9
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 9 | 1 | 3 | 5 | 6 | 9 |
Because the upper digit (3) in the millions 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 (13).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 9 | 1 | 3 | 5 | 6 | 9 |
Subtract the numbers in the millions column from the top number:
13-7=6
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 6 | 9 | 1 | 3 | 5 | 6 | 9 |
Because the upper digit (2) in the ten millions column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (12).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 12 | |||||||||
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 6 | 9 | 1 | 3 | 5 | 6 | 9 |
Subtract the numbers in the ten millions column from the top number:
12-8=4
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 12 | |||||||||
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 4 | 6 | 9 | 1 | 3 | 5 | 6 | 9 |
Because the upper digit (1) in the hundred millions 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 (11).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 11 | |||||||||
| 1 | 12 | |||||||||
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 4 | 6 | 9 | 1 | 3 | 5 | 6 | 9 |
Subtract the numbers in the hundred millions column from the top number:
11-9=2
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 11 | |||||||||
| 1 | 12 | |||||||||
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 2 | 4 | 6 | 9 | 1 | 3 | 5 | 6 | 9 |
Write 0 in the billions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 11 | |||||||||
| 1 | 12 | |||||||||
| 2 | 13 | |||||||||
| 3 | 15 | |||||||||
| 8 | 10 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | |
| - | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| 0 | 2 | 4 | 6 | 9 | 1 | 3 | 5 | 6 | 9 |
The solution is: 246,913,569
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