We divide 642331 by 51
We're looking to find how many times 51 goes into 642331.

Step 1:
The number 51 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 51

Advancing to step 2:
If we divide 64 by 51, we get 1 and a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 51 from 64 to get 13.
Grab the next digit (2) from the dividend, add it to 13, then carry on: 132 / 51

On to step 3:
132 divided by 51 is 2 with a remainder of 30.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 102 from 132, we get 30.
Include the next digit (3) from the dividend after 30, then repeat: 303 / 51

Advancing to step 4:
The number 51 fits into 303 5 times, leaving a remainder of 48.
Write down 5 as next digit of the result. 
Result so far: 125.0
If we subtract 255 from 303, we get 48.
Fetch the next digit (3) from the dividend, attach it to 48 and continue: 483 / 51

Step 5:
51 can be fit into 483 9 times, resulting in a remainder of 24.
The number 9 becomes the next digit in our result. 
Result so far: 1259.0
If we subtract 459 from 483, we get 24.
Take the next digit (1) from the dividend and append it to 24, then repeat: 241 / 51

On to step 6:
241 divided by 51 is 4 with a remainder of 37.
Record the quotient 4 as the next digit in the result. 
Result so far: 12594.0
Deduct 204 from 241 and we're left 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.

Advancing to step 7:
51 goes into 370 7 times with a remainder of 13.
The next digit of our result is 7. 
Result so far: 12594.7
If we take 357 away from 370, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 8:
51 can be fit into 130 2 times, resulting in a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 12594.72
If we take 102 away from 130, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 9:
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: 12594.725
The remainder is 25 after subtracting 255 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 10:
250 divided by 51 is 4 with a remainder of 46.
The next digit of our result is 4. 
Result so far: 12594.7254
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 11:
460 divided by 51 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 12594.72549
If we subtract 459 from 460, 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.

Step 12:
10 divided by 51 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 12594.72549
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.

Step 13:
100 divided by 51 is 1 with a remainder of 49.
The next digit of our result is 1. 
Result so far: 12594.7254901
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.

Advancing to step 14:
490 divided by 51 is 9 with a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 12594.72549019
Subtract 459 from 490 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

The final outcome is 12594.72549019, with a leftover of 3.1e-08.