We look at the division of 64031569 by 621 
Our goal is to divide 64031569 by 621.

Advancing to step 1:
6 divided by 621 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 621

Let's proceed to step 2:
64 divided by 621 is 0 with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Bring next digit (0) of the dividend behind the 64 and repeat the process: 640 / 621

Going ahead to step 3:
The number 621 fits into 640 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 621 from 640 and we're left with 19.
Include the next digit (3) from the dividend after 19, then repeat: 193 / 621

Advancing to step 4:
621 goes into 193 0 times with a remainder of 193.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 193 to get 193.
Grab the next digit (1) from the dividend, add it to 193, then carry on: 1931 / 621

Moving on to step 5:
621 can be fit into 1931 3 times, resulting in a remainder of 68.
Use 3 as the next digit of our solution. 
Result so far: 103.0
Subtracting 1863 from 1931 leaves us with 68.
Fetch the next digit (5) from the dividend, attach it to 68 and continue: 685 / 621

On to step 6:
621 goes into 685 1 times with a remainder of 64.
Record the quotient 1 as the next digit in the result. 
Result so far: 1031.0
Subtracting 621 from 685 leaves us with 64.
Grab the next digit (6) from the dividend, add it to 64, then carry on: 646 / 621

Step 7:
If we divide 646 by 621, we get 1 and a remainder of 25.
Use 1 as the next digit of our solution. 
Result so far: 10311.0
If we take 621 away from 646, we end up with 25.
Append the next digit (9) from the dividend to 25 and continue with: 259 / 621

Step 8:
If we divide 259 by 621, we get 0 and a remainder of 259.
The number 0 becomes the next digit in our result. 
Result so far: 103110.0
Subtract 0 from 259 to get 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Step 9:
The number 621 fits into 2590 4 times, leaving a remainder of 106.
Put 4 as the next digit of the answer. 
Result so far: 103110.4
Subtracting 2484 from 2590 leaves us with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Going ahead to step 10:
If we divide 1060 by 621, we get 1 and a remainder of 439.
Write down 1 as next digit of the result. 
Result so far: 103110.41
Subtract 621 from 1060 to get 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

On to step 11:
621 goes into 4390 7 times with a remainder of 43.
The next digit of our result is 7. 
Result so far: 103110.417
If we subtract 4347 from 4390, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 12:
When dividing 430 by 621, we get 0 with a remainder of 430.
Use 0 as the next digit of our solution. 
Result so far: 103110.417
If we take 0 away from 430, we end up with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

On to step 13:
621 can be fit into 4300 6 times, resulting in a remainder of 574.
Put 6 as the next digit of the answer. 
Result so far: 103110.41706
If we take 3726 away from 4300, we end up with 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Moving on to step 14:
If we divide 5740 by 621, we get 9 and a remainder of 151.
The next digit of our result is 9. 
Result so far: 103110.417069
If we subtract 5589 from 5740, we get 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Step 15:
The number 621 fits into 1510 2 times, leaving a remainder of 268.
The next digit of our result is 2. 
Result so far: 103110.4170692
Subtracting 1242 from 1510 leaves us with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Advancing to step 16:
If we divide 2680 by 621, we get 4 and a remainder of 196.
The next digit of our result is 4. 
Result so far: 103110.41706924
Subtract 2484 from 2680 to get 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

After the division, we end up with 103110.41706924 and a remainder of 1.96e-07.