Solution - Long subtraction
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 |
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
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 number to the left (60) which becomes (59) and get (10).
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
Subtract the numbers in the ones column from the top number:
10-5=5
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 5 |
Subtract the numbers in the tens column from the top number:
9-2=7
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 7 | 5 |
Subtract the numbers in the hundreds column from the top number:
5-0=5
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 5 | 7 | 5 |
Subtract the numbers in the thousands column from the top number:
1-0=1
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 1 | 5 | 7 | 5 |
Because the upper digit (0) in the ten thousands column is too small to get a positive difference, borrow 1 from the number to the left (40) which becomes (39) and get (10).
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||||||
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 1 | 5 | 7 | 5 |
Subtract the numbers in the ten thousands column from the top number:
10-1=9
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||||||
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 9 | 1 | 5 | 7 | 5 |
Write 9 in the hundred thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||||||
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 9 | 9 | 1 | 5 | 7 | 5 |
Write 3 in the millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||||||
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 3 | 9 | 9 | 1 | 5 | 7 | 5 |
Write 6 in the ten millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||||||
| 5 | 9 | 10 | ||||||
| 6 | 4 | 0 | 0 | 1 | 6 | 0 | 0 | |
| - | 1 | 0 | 0 | 2 | 5 | |||
| 6 | 3 | 9 | 9 | 1 | 5 | 7 | 5 |
The solution is: 63,991,575
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