We look at the division of 636395 by 51 
Our goal is to divide 636395 by 51.

On to step 1:
51 goes into 6 0 times 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.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 51

Going ahead to step 2:
If we divide 63 by 51, we get 1 and a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 51 from 63 leaves us with 12.
Include the next digit (6) from the dividend after 12, then repeat: 126 / 51

Going ahead to step 3:
If we divide 126 by 51, we get 2 and a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 102 from 126 to get 24.
Bring next digit (3) of the dividend behind the 24 and repeat the process: 243 / 51

On to step 4:
If we divide 243 by 51, we get 4 and a remainder of 39.
Use 4 as the next digit of our solution. 
Result so far: 124.0
Subtracting 204 from 243 leaves us with 39.
Fetch the next digit (9) from the dividend, attach it to 39 and continue: 399 / 51

Moving on to step 5:
51 can be fit into 399 7 times, resulting in a remainder of 42.
The number 7 becomes the next digit in our result. 
Result so far: 1247.0
The remainder is 42 after subtracting 357 from 399.
Bring next digit (5) of the dividend behind the 42 and repeat the process: 425 / 51

Let's proceed to step 6:
The number 51 fits into 425 8 times, leaving a remainder of 17.
Put 8 as the next digit of the answer. 
Result so far: 12478.0
Deduct 408 from 425 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
51 goes into 170 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 12478.3
The remainder is 17 after subtracting 153 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 8:
When dividing 170 by 51, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 12478.33
If we take 153 away from 170, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

In conclusion, the division gives 12478.33 with a balance of 0.017.