We look at the division of 646175 by 51 
Let's see how many times 51 fits into 646175.

Going ahead to step 1:
51 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
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 / 51

Advancing to step 2:
When dividing 64 by 51, we get 1 with a remainder of 13.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 51 from 64, we get 13.
Take the next digit (6) from the dividend and append it to 13, then repeat: 136 / 51

Going ahead to step 3:
136 divided by 51 is 2 with a remainder of 34.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtracting 102 from 136 leaves us with 34.
Append the next digit (1) from the dividend to 34 and continue with: 341 / 51

Let's proceed to step 4:
The number 51 fits into 341 6 times, leaving a remainder of 35.
The next digit of our result is 6. 
Result so far: 126.0
Subtracting 306 from 341 leaves us with 35.
Bring next digit (7) of the dividend behind the 35 and repeat the process: 357 / 51

Moving on to step 5:
357 divided by 51 is 7 with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 1267.0
The remainder is 0 after subtracting 357 from 357.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 51

Advancing to step 6:
If we divide 5 by 51, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 12670.0
Subtract 0 from 5 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
When dividing 50 by 51, we get 0 with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 12670.0
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
51 can be fit into 500 9 times, resulting in a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 12670.09
If we take 459 away from 500, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 9:
51 can be fit into 410 8 times, resulting in a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 12670.098
If we take 408 away from 410, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 10:
20 divided by 51 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 12670.098
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
51 can be fit into 200 3 times, resulting in a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 12670.09803
If we take 153 away from 200, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 12:
51 can be fit into 470 9 times, resulting in a remainder of 11.
The next digit of our result is 9. 
Result so far: 12670.098039
Subtract 459 from 470 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 13:
If we divide 110 by 51, we get 2 and a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 12670.0980392
The remainder is 8 after subtracting 102 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 14:
80 divided by 51 is 1 with a remainder of 29.
The next digit of our result is 1. 
Result so far: 12670.09803921
Subtract 51 from 80 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final outcome is 12670.09803921, with a leftover of 2.9e-08.