We're dividing 642642 by 51 
We want to divide 642642 by 51.

Moving on to step 1:
6 divided by 51 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.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 51

Step 2:
51 can be fit into 64 1 times, resulting in a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 51 from 64, we get 13.
Take the next digit (2) from the dividend and append it to 13, then repeat: 132 / 51

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
Subtract 102 from 132 to get 30.
Take the next digit (6) from the dividend and append it to 30, then repeat: 306 / 51

Step 4:
If we divide 306 by 51, we get 6 and a remainder of 0.
The next digit of our result is 6. 
Result so far: 126.0
If we take 306 away from 306, we end up with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 51

Step 5:
If we divide 4 by 51, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 1260.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 51

Going ahead to step 6:
If we divide 42 by 51, we get 0 and a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 12600.0
Deduct 0 from 42 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 7:
51 goes into 420 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 12600.8
If we take 408 away from 420, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 8:
When dividing 120 by 51, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 12600.82
If we subtract 102 from 120, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
If we divide 180 by 51, we get 3 and a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 12600.823
Subtract 153 from 180 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 10:
When dividing 270 by 51, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 12600.8235
If we subtract 255 from 270, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 11:
If we divide 150 by 51, we get 2 and a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 12600.82352
If we take 102 away from 150, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 12:
When dividing 480 by 51, we get 9 with a remainder of 21.
The next digit of our result is 9. 
Result so far: 12600.823529
Subtracting 459 from 480 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 13:
When dividing 210 by 51, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 12600.8235294
If we subtract 204 from 210, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 14:
60 divided by 51 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 12600.82352941
If we subtract 51 from 60, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Our division results in 12600.82352941 with a remaining 9e-09.