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 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 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 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 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 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 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 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 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 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 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 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 0 | 0 | 0 | 0 | 0 |
Because the upper digit (0) in the hundred thousands column is too small to get a positive difference, borrow 1 from the number to the left (8,000) which becomes (7,999) and get (10).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 10 | ||||||
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 0 | 0 | 0 | 0 | 0 |
Subtract the numbers in the hundred thousands column from the top number:
10-8=2
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 10 | ||||||
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 2 | 0 | 0 | 0 | 0 | 0 |
Write 9 in the millions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 10 | ||||||
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 9 | 2 | 0 | 0 | 0 | 0 | 0 |
Write 9 in the ten millions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 10 | ||||||
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 9 | 9 | 2 | 0 | 0 | 0 | 0 | 0 |
Write 9 in the hundred millions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 10 | ||||||
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 9 | 9 | 9 | 2 | 0 | 0 | 0 | 0 | 0 |
Write 7 in the billions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 10 | ||||||
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 0 | 0 | 0 | 0 | 0 | ||||
| 7 | 9 | 9 | 9 | 2 | 0 | 0 | 0 | 0 | 0 |
The solution is: 7,999,200,000
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