645571 ÷ 63 
Let's see how many times 63 fits into 645571.

Going ahead to step 1:
When dividing 6 by 63, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 63

Let's proceed to step 2:
When dividing 64 by 63, we get 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 63 from 64 leaves us with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 63

Advancing to step 3:
15 divided by 63 is 0 with a remainder of 15.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 15, we get 15.
Append the next digit (5) from the dividend to 15 and continue with: 155 / 63

Going ahead to step 4:
63 can be fit into 155 2 times, resulting in a remainder of 29.
Record the quotient 2 as the next digit in the result. 
Result so far: 102.0
Deduct 126 from 155 and we're left with 29.
Include the next digit (7) from the dividend after 29, then repeat: 297 / 63

Step 5:
The number 63 fits into 297 4 times, leaving a remainder of 45.
Write down 4 as next digit of the result. 
Result so far: 1024.0
Subtract 252 from 297 to get 45.
Fetch the next digit (1) from the dividend, attach it to 45 and continue: 451 / 63

Advancing to step 6:
The number 63 fits into 451 7 times, leaving a remainder of 10.
The next digit of our result is 7. 
Result so far: 10247.0
Subtract 441 from 451 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 7:
100 divided by 63 is 1 with a remainder of 37.
Write down 1 as next digit of the result. 
Result so far: 10247.1
Subtract 63 from 100 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 8:
63 goes into 370 5 times with a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 10247.15
Deduct 315 from 370 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 9:
When dividing 550 by 63, we get 8 with a remainder of 46.
Use 8 as the next digit of our solution. 
Result so far: 10247.158
Subtracting 504 from 550 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 10:
The number 63 fits into 460 7 times, leaving a remainder of 19.
Put 7 as the next digit of the answer. 
Result so far: 10247.1587
The remainder is 19 after subtracting 441 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 11:
63 can be fit into 190 3 times, resulting in a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 10247.15873
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 12:
63 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 10247.15873
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 13:
100 divided by 63 is 1 with a remainder of 37.
Put 1 as the next digit of the answer. 
Result so far: 10247.1587301
Subtracting 63 from 100 leaves us with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 14:
63 goes into 370 5 times with a remainder of 55.
The next digit of our result is 5. 
Result so far: 10247.15873015
If we subtract 315 from 370, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

The final result is 10247.15873015 with a remainder of 5.5e-08.