We look at the division of 51490766 by 402 
Our goal is to divide 51490766 by 402.

Step 1:
402 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 402

Going ahead to step 2:
When dividing 51 by 402, we get 0 with a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Take the next digit (4) from the dividend and append it to 51, then repeat: 514 / 402

Step 3:
The number 402 fits into 514 1 times, leaving a remainder of 112.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 402 from 514 leaves us with 112.
Grab the next digit (9) from the dividend, add it to 112, then carry on: 1129 / 402

Going ahead to step 4:
When dividing 1129 by 402, we get 2 with a remainder of 325.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 804 from 1129, we get 325.
Grab the next digit (0) from the dividend, add it to 325, then carry on: 3250 / 402

On to step 5:
If we divide 3250 by 402, we get 8 and a remainder of 34.
Use 8 as the next digit of our solution. 
Result so far: 128.0
If we subtract 3216 from 3250, we get 34.
Append the next digit (7) from the dividend to 34 and continue with: 347 / 402

Let's proceed to step 6:
347 divided by 402 is 0 with a remainder of 347.
Write down 0 as next digit of the result. 
Result so far: 1280.0
Subtracting 0 from 347 leaves us with 347.
Take the next digit (6) from the dividend and append it to 347, then repeat: 3476 / 402

On to step 7:
402 goes into 3476 8 times with a remainder of 260.
The number 8 becomes the next digit in our result. 
Result so far: 12808.0
Subtract 3216 from 3476 to get 260.
Bring next digit (6) of the dividend behind the 260 and repeat the process: 2606 / 402

Advancing to step 8:
402 goes into 2606 6 times with a remainder of 194.
Write down 6 as next digit of the result. 
Result so far: 128086.0
If we take 2412 away from 2606, we end up with 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Step 9:
If we divide 1940 by 402, we get 4 and a remainder of 332.
The next digit of our result is 4. 
Result so far: 128086.4
The remainder is 332 after subtracting 1608 from 1940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Going ahead to step 10:
The number 402 fits into 3320 8 times, leaving a remainder of 104.
Record the quotient 8 as the next digit in the result. 
Result so far: 128086.48
If we take 3216 away from 3320, we end up with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 11:
If we divide 1040 by 402, we get 2 and a remainder of 236.
Write down 2 as next digit of the result. 
Result so far: 128086.482
Subtracting 804 from 1040 leaves us with 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Advancing to step 12:
402 can be fit into 2360 5 times, resulting in a remainder of 350.
The number 5 becomes the next digit in our result. 
Result so far: 128086.4825
The remainder is 350 after subtracting 2010 from 2360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Advancing to step 13:
402 goes into 3500 8 times with a remainder of 284.
Use 8 as the next digit of our solution. 
Result so far: 128086.48258
If we take 3216 away from 3500, we end up with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Step 14:
402 goes into 2840 7 times with a remainder of 26.
The number 7 becomes the next digit in our result. 
Result so far: 128086.482587
If we subtract 2814 from 2840, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 15:
When dividing 260 by 402, we get 0 with a remainder of 260.
Put 0 as the next digit of the answer. 
Result so far: 128086.482587
Subtract 0 from 260 to get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 16:
2600 divided by 402 is 6 with a remainder of 188.
Record the quotient 6 as the next digit in the result. 
Result so far: 128086.48258706
If we take 2412 away from 2600, we end up with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

After the division, we end up with 128086.48258706 and a remainder of 1.88e-07.