We're dividing 641803 by 51 
We want to divide 641803 by 51.

Step 1:
When dividing 6 by 51, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 51

On to step 2:
51 can be fit into 64 1 times, resulting in a remainder of 13.
The next digit of our result is 1. 
Result so far: 1.0
If we take 51 away from 64, we end up with 13.
Append the next digit (1) from the dividend to 13 and continue with: 131 / 51

On to step 3:
51 can be fit into 131 2 times, resulting in a remainder of 29.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 29 after subtracting 102 from 131.
Include the next digit (8) from the dividend after 29, then repeat: 298 / 51

On to step 4:
The number 51 fits into 298 5 times, leaving a remainder of 43.
The number 5 becomes the next digit in our result. 
Result so far: 125.0
If we subtract 255 from 298, we get 43.
Bring next digit (0) of the dividend behind the 43 and repeat the process: 430 / 51

Moving on to step 5:
The number 51 fits into 430 8 times, leaving a remainder of 22.
Use 8 as the next digit of our solution. 
Result so far: 1258.0
The remainder is 22 after subtracting 408 from 430.
Include the next digit (3) from the dividend after 22, then repeat: 223 / 51

Let's proceed to step 6:
The number 51 fits into 223 4 times, leaving a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 12584.0
Subtract 204 from 223 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
190 divided by 51 is 3 with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 12584.3
Subtracting 153 from 190 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.

Step 8:
51 goes into 370 7 times with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 12584.37
The remainder is 13 after subtracting 357 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 9:
130 divided by 51 is 2 with a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 12584.372
If we subtract 102 from 130, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 10:
51 can be fit into 280 5 times, resulting in a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 12584.3725
Deduct 255 from 280 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 11:
If we divide 250 by 51, we get 4 and a remainder of 46.
The next digit of our result is 4. 
Result so far: 12584.37254
Deduct 204 from 250 and we're left 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 12:
51 goes into 460 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 12584.372549
Deduct 459 from 460 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 13:
10 divided by 51 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 12584.372549
If we subtract 0 from 10, we 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.

Advancing to step 14:
51 can be fit into 100 1 times, resulting in a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 12584.37254901
Subtract 51 from 100 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

The quotient of the division is 12584.37254901, and the remainder is 4.9e-08.